will the arcade version have enough memory for me to save games?

topic.

i'm really only concerned with offline games for now. i'll get a 20 or 60 g later. so will the arcade have enough memory to save games or is it just a way to sell more 360's?

It should be enough, for a while.

FO3 saves take ~7 MB. So, if you have FO3 with 2 characters, 2 saves each (plus autosave), that is ~42 MB for one game.

Of course, not all games take that much, but you should plan on getting a HDD at some point.