If you have a Fry's nearby they have generic dual channel DDR2 kits they put on sale fairly often. I picked up a 1GB kit for $160. It is off-brand Leagcy Electronics memory, but it memtests just fine in the board and seems quite stable. It is a bit pokey at 4-4-4 compared to low latency PC3200, but then again the Corsair XMS or Kingston Hyper-X 1GB low latency kit costs quite a bit more than what I paid for my DDR2, so I'll live with a bit less bandwidth.
If you seriously don't plan to game at all, the cheap X300 non-SE video cards are a pretty good option, like the Sapphire model that Newegg sells for around $82 shipped. It is based off of the 9600NP, so it still has all the video goodies the X600 has (like DivX and WMV hardware acceleration) for about $40 less. Like the other recent ATi cards also uses the Ati onboard TMDS for DVI output, so the image quality is nice on a large flatpanel like the 2001FP or 2005FPW.
Also don't forget that the 915PBL only comes with one IDE connector, so if you currently have and IDE hard drive (or drives), you will have to upgrade to SATA as well. I got one of the new Seagate quasi-SATA-II drives that support NCQ at Newegg. It was around $90 for the 120GB version when I bought it a few weeks ago, but now the price has jumped up to over $100 in the last week for some odd reason. It is a nice fast drive. Not sure if the NCQ is really making a difference (or the Hyperthreading), but the new system feels very smooth and responsive - even when I'm defragging or running a Norton AV scan while I'm working on another application.
I used the bundle to build a whole new system for my wife, so the relatively small price increase over a comparable system using older technology wasn't that drastic. It is also a good chance to play around with some of the bleeding edge tech for a fairly low price if you like that kind of thing.