So you have a 360 as your main console?
Or is the "brief and occasional access
" PS3 what you play all your games with?
Either way get yourself the MGS HD Collection.
It comes with MGS2, MGS3, and Peace Walker (originally a PSP exclusive) all redone in HD. It also comes with the original Metal Gears, first found on the MSX back in the 80's.
So basically 5 games for like $40, maybe $30 if you search around.
If the PS3 is what you really you play with you can buy MGS1, where that Psycho Mantis battle is from, for 10 bucks.
And you can get MGS4 for like $5-15.
Those two can only be found on PS3 though.
So 7 games. Oh and Metal Gear Solid: ground Zeros is being released next year.
But you ain't ready for that my son.....