^ HDMI comes on all 360's now I believe...my arcade from last year has it and to add to the list of exclusive games, Resistance for PS3 and Fable for 360 (there are more but nothing really of my interest)
Getting PS3 jsut for Metal Gear Solid 4 is well worth it imo >

Metal Gear Solid 4 >>>>>>>> Gears of War 2 >
Correct me if im wrong but i dont think you can play online with modded xbox
i have both and i choose ps3
you can play online with a modded 360 but there's a risk of being banned but most games are stealth patched so they're usually safe to play online...
modded xbox 360 will save you a lot of money on games so if money in the long term is a considering factor than get the xbox, downloading games will save you a lot of money!
I have both systems and I play my PS3 much more than the 360 (even though I have that modded and have a lot of games for it) but for games that I seriously do want to play, I would buy for the PS3 because I like the controller much more, I rarely ever touch my 360 and only download games I want to try out on it. So if you have the money to spend on games and blu-ray's, get a PS3, plus side of having it is free online gaming (though people claim its not as great an experience, but Call of Duty online is still awesome in PS3 >

), there's not much accessories you need to buy initially (ie charger and rechargeable battery for 360, no built in wifi at least not on the system i got last year)