Most of the avid gamers in my trusted network I know who have all 3 consoles and a relatively good gaming PC follow roughly the same pattern:
PS3: They rent Blu-rays and purchase the odd one or two exclusives and PSN games.
Wii: They have 4 nunchuks/remotes and whip them out only when company/family/nephews/nieces are around.
360: They play online almost every other day and buy relatively more exclusives including XBLA.
PC: Collecting dust usually since most have given up WoW but Burning Crusade/WotLK keeps it alive and alot of anticipation for Starcraft 2/Diablo 3.
I wouldnt want to pay additionally for Blu-Ray/higher specs for my PC at the moment because Im having way too much fun on the 360. Thats just me. It should always boil down to what games you want to play and get the hardware to play those games - thats the best advice for anyone.
Picking only 6 recommendations for 360, I would say Gears of War 2, Halo 3, Mass Effect, BioShock, GTA4, Rock Band 2 or Guitar Hero World Tour. But it really depends what games you like.
