As for ps3 v 360, I don't see how ps3 is worth the price tag over the 360, despite what the ps3 fanboys are sure to say after I post this.
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Because they are both consoles that have similar qualities ( graphics - wise and a lot of games are on both platforms ) there are a couple of things you need to consider:
360: Mass effect; Alan Wake; Halo 3; Gears of War 2
PS 3: Final Fantasy XIII; Metal Gear Solid 4; Gran Turismo 5; Haze
Then PS3 has Blu - Ray which won the format war against HD DVD. Another thing to consider is that PSN is free, wheras the live service has a fee. So at the end of the day, the ***les are what makes the difference i think. Personally, Final Fantasy is the big one for me. It's just too brilliant to not have imo.
Now, where the Wii is concerned, here is the question you have to ask:
After a night of partying, you wake up, eat, and are just too darn screwed to do anything, so why not fester on the couch with some great gaming. Do you:
A: Rally feel like putting on a couple of games made for 7 year olds, and stand in front of the TV with no energy, and no motivation to look like an idiot by "virtually" swinging your arms around like a masturbating wallrus or;
B: Lay on that comfy couch, put on a serious game (made for gamers, and not babies) and still manage to get a smile out of your droopy hungover face....
So, if you want a serious gaming system to actually play GAMES on, get the 360 (seeing as you dont want a PS3). If you feel like swinging your arms around at graphically challenged baby characters, get a Wii.