Thats a tough decision... just get both.
In all seriousness, if you still cant decide after playing the demos (i think the killzone demo is coming out soon... although I'm not 100% sure when) then I would slightly lean towards KZ2. The guys on the listenup podcast were raving about the single...
sucks this game wont work with 64-bit vista... I really wanted to get this. I guess PSN will have to do. Anyone have impressions on the game before I take the plunge?
You guys talked about the PS3 having a 10 year lifespan, but why do you assume there wont be another Sony system before the PS3 dies? The PS1 had a lifespan of around 10 years ('95-'06) and the PS2 is reaching its 10 year anniversary soon. Each of these systems had their replacements arrive...