Although you don't mention what processor you use, PC2700 and even PC2100 (depending on your CPU) is more than enough for you today. I suggest getting PC3200 though, because later on, if you decide to get a 400MHz FSB Athlon XP processor, you won't have to upgrade your memory.
Also, from my experience I'd say go for Corsair XMS memory modules. I always used to go for cheap memory (of course money was the problem) but last month I decided to try Corsair 2x256MB PC3200LL (Twinx) and I can only say that the difference in performance worths the extra money!