You might want to wait a month or two if you can. There are rumors that there will be a 15.4 version of the powerbook that includes the illuminated keyboard, airport extreme, Bluetooth, etc., but they are just rumors.
I wouldn't expect the 15.4" version (which probably will have a LOWER resolution than the 15.2" by the way) to ship until mid-summer.
A couple of reasons for this. I suspect they'll need a new chip design for major speed increases. The current chips are only 0.18 u after all. (Motorola still doesn't admit their G4 7455 chips are available past 1 GHz.) Also, they need an OS 9 bootable machine. The current 12" and 17" (which hasn't even shipped yet) can run OS 9 as Classic, but cannot boot into it.
Im leaning toward the 15" Superdrive now, and removing the superdrive, because the superdrive model is faster and has more ram etc...
You can configure it without a SuperDrive. The combo drive is $200 less.
Is there anything that you are going to do that is going to tax memory bandwidth. DDR is obviously preferable, but if all you are doing is word processing/web surfing/mp3 playing, I wouldn't worry about it.
The current Mac CPUs cannot use DDR. The 7455 G4 is incapable of double-pumped data access. DDR will only be useful in actions bypassing the CPU. So right now, DDR on a Mac (except for maybe the Xserve with certain applications) at best offers only a 1-2% speed increase. OTOH, the 7457-RM G4s are supposed to support DDR. Unfortunately, those are a while away. The next iteration of the chip is the 7457. It is 0.13 u like the 7457-RM, but with no DDR support. It is expected to be shipping by Q3.
Ive got a 500mhz iBook, and while it is sluggish (I wouldnt call it slow) it rocks.
I sold my iBook 600 (640 MB) because I found it slow. I bought a 1 GHz TiBook. It flies.

Personally for OS X I tend to tell people to stick with an iBook 700 or up. But of course, YMMV.
mine was ~$1518 with airport extreme card through the Apple Developer Connection. Check on their website.
Yep. That deal is killer. Too bad I can't get in on it.
Don't get the superdrive, its overpriced and its only a 1x burner. Pay $150 and get a 4x burner for your PC. It will save you some cash.
Except that you lose the ability to use iDVD. iDVD 2 rox, and people are saying iDVD 3 is much better. (I don't have iDVD 3 yet.) iMovie 2 is pretty good. iMovie 3 is much more feature rich, but unfortunately it's not as stable as iMovie 2. Also, while the speed is not bad on my TiBook, iBook users are ripping their hair out because of the speed. Both are significantly better than most PC consumer programs though, and I've seen no match for iDVD 2 yet, much less iDVD 3. Because of the
uber-cool DVD menu themes, iDVD 3 needs something like 2.5
GB just for basic installation. :Q