Thinking about getting a X360...

So with the new price drop and Gears 2 looks pretty sick I'm really tempted to get a 360 and complete my PSWii60. Anyways I just got a couple of questions. I plan on getting the new lower priced 20 GB model cause I already got a 320 GB PS3 and I don't think I'll need that much space on the 360.

With that 20 GB bundle, what else would I need? I plan on playing 2 players, and possibly online too. Any accessories as well that might be good too?

Thanks!

Since you dont want too fansy, probly a normal 20g 360 will do unless you play it a ton then you might as well grab a 60gKrayler

How big are save files, like what else would the space be used for? The only thing I can think of that I would use the 360's space for is game saves, demos, and any other requirements. Videos and stuff I'll use the PS3.