Good Morning Mr. Panzer.
I would recommend that you reconsider your preliminary choice of Vista 32 for your OS. Of course, there's nothing wrong with Vista 32, but it has inherent limitations that will ultimately work against you. For instance, since you are going to be doing some heavy duty video editing, that means you will likely have some memory hog applications running in RAM at the same time. A 32 bit OS has an absolute limitation of 4GB of RAM memory, and that theoretical amount is further reduced by the memory that is utilized by the various components in the system. With 4GB of RAM in a 32 bit system, you will be very lucky to have a net of 3.25GB of memory to work with. That will also result in some significant disk IO, since the paging file will surely get a work out in such a situation.
May I suggest that you load Vista 64 from the beginning (if you load Vista 32, there's NO way to upgrade it to Vista 64 without wiping out your C drive and doing a complete fresh install). You also should consider investing in 8GB of memory. I am presently using 4 x 2GB sticks of G.Skill PC8000 in my rig, and it works very well. You can buy that memory from the Egg here:
Newegg.com G.Skill PC8000
As far as a PSU is concerned, your Enermax unit might be suitable, but that depends on what other stuff you put in your box. If you have 3 or 4 hard drives, several optical disks, a few other items, i.e. a TV tuner card, etc, that PSU probably won't cut it. I've been using ThermalTake ToughPower (Modular Cables) PSUs and presently run the ToughPower 850 in my rig. It works exceptionally well, and is not anywhere near its useful limit (and that's with 6 hard drives, 3 optical drives, TV tuner, 8800GTX, 8GB RAM, 6 Fans, eSATA card, 2xUSB cards, etc.). In the world of PSUs, having a PSU with significantly extra capacity will reduce the stress factor on all the electrical loads in the PC, and the PSU will run much cooler, since you're not working the crap out of it.
I also use the Zalman 9700 (that might have been my previous post that you read on that), and all you have to do is simply take a sharp hobby knife and cut the four corners off the plastic bottom plate (keep you fingers out of the way of the knife blade!), then shave the cut-off corners down a bit more, and they will fit right along with the Cray-Cool bottom plate. Works like a charm! The is NO NEED to remove any part of the stock cooling components from the board. BTW, if you do remove any part of those stock cooling components from the board, don't expect to be ever successful in attempting to send the board back to Gigabyte for a RMA repair, since they will automatically reject the board as being modified!
Good Luck and enjoy your new rig. Best regards to everyone - Blessed Christmas! TheBeagle

:beer: