all the problems with the 360s were with the first ones that came out. those problems have been fixed. if you buy a 360 now, you wont have any of those problems. and xbox live>whatever ps3 has. get the 360.
oh yea and i forgot to mention +1 to not leaving your 360 or ps3 on when youre not using it. thats just common sense. oh and if you get the 360, get the modern warfare 2 special edition.