I all. I just got here.

(heh. i am a nOOb) anyways...
I have a Matrox G550 on my work (which is main unfortunately) rig. 2D is simply great. (I read a video signal detailed analysis somewhere on the web a few months ago featuring all kinds of cards from Matrox to BBA to Gigabyte to Asus). That particular G550 they used (well dispite no cards/DACs are identical) has the best analog video signal quality (closest to a sin wave function). The G-Series drivers are simply stable, and when I use the G550 on my P95f+, image is PURE at 1600x1200 (though higher i.e. 2048x1536 may get worse because of the crappy 64-bit DDR frame buffer interface... though i don't know if it's the monitor's limitations or not). I am currently running the G550 and P95f+ at 1280x1024x32bpp@75Hz. I choose Matrox because I use it for around 8 hours daily, and it must be stable, crystal clear, and easy on the eyes. For this reason I have been using Matrox cards from the pre-Millennium ages. Whenever I look at nV/3dfx solutions, I feel lucky to have Matrox around... (which sucks because Matrox = no gaming. heh.) Note: Stability is probably why AMD throws in a G450 on their Athlon 64 demo rig "at" the IDF. For an alpha machine like that stability is definitely a plus.
btw as a BBA Radeon 8500 user (well... 8500s are worse than 7x00s in 2D anyways but who cares), I say it doesn't come close to my G card as i remembered: as I put the card into this rig I need to take breaks ever 2 hrs or so. That's why I swapped the card out, and uninstalling the catalyst drivers... is a pain

(Okay I haven't seen a Radeon 9xxx card so I don't know how much they have come along after 8500)
Anways... back to the Parhelia subject...
I hope you are aware of the "banding issue" with ALL Matrox Parhelia cards on the market right now. Most of you hardcore ones

probably know about it, but for those who don't know.... basically the problem is whenever you try to run a 3D game in windowed mode, lots of strange lines appear on the screen. This problem is not sloved when you use DVI connections... so probably not the DAC's problem. There is no answer solving this problem on the Matrox Tech Support forums (btw their tech support is top-notch besides of this incident). Most think this is a bug hidden in the silicon as there's no solutions given from the officials... so that's a big minus for anyone thinking about the Parhelia. However, for some reason, when you run windowed 3d apps like 3D Studio MAX / Maya / CAD / all DCC programs, this is not a problem at all. (Besides lately Matrox is targetting Parhelia at Workstation users w/their 3 screen 3D acceleration)
Let's see 2D now... I don't have a Parhelia, but Parhelias should even outperform a G550 in terms of 2D quality. They use 5th order filters so I suspect a Parhelia must generate EXTERMELY clean video signals w/virtually no ghosting @ 2048x1536. Other than that, the text altialiasing should be a big plus for 2D quality. Personally I won't be worried about Parhelia doing bad in 2D... Matrox's 2D is simply legendary.
Of course, seeing that you have a Radeon 9700, I would be worried about 3D the most in your case. Simply put: Parhelia has mediocre 3D

, and is the only problem about parhelia (and for 9/10 of the populations probably the most important factor) Please note that Anisotropic Filtering is still limited to 2x in drivers (though it really should have supported 64 samples... which leads me to think it's another bug on the silicon). Also note FAA does not work perfectly all the time... sometimes it does 16x FAA nicely... but sometimes the function does not detect some lines. As you are probably aware that Parhelia is not a DX9 card... so if you want to do shaders programming, stick with Radeon 9700s.
Okay... there are a few advantages about Parhelia gaming... SurroundGaming. Personally I really want to try that... some says it's a feature that really improve gaming experience, but again who's paying for the monitors

. ***I am not sure about this*** but I heard FPS are a bit more stable and does less of that 200fps-->50fps-->100fps stuff.
About DVD... if i am correct it should be great... seeing that Matrox has a professional video authoring department. I think Video authoring is what Matrox is all about. Besides Matrox also targets Parhelia at video workstations (da*m they target it at every sector...) and use them with their professional RT.X solutions. NOTE: i think there are problems with Parhelia and some 3rd party pro video caputere boards and some Hauppauge WinTV TV cards)
It's a good all-round card... really... but FPS gaming on Parhelia in terms of speed is
PURE CRAP comparing to ATI/nV chips, even though it has support for SurroundGaming, along with some silicon bugs. And i must emphesis that if you are a hardcore gamer, don't even bother!
It is known that there are Parhelia AGP8X cards made by Matrox, and is supposed to fix all of these bugs with fixed FAA also. But we probably won't see that anytime soom before Matrox gets rid of all the current Parhelia 4X cores it made.
And there's almost Pitou

the supposedly next-gen MGA core logic w/DX9 full. And of course... it is said to be taped out, but on hold.