I have pretty much the same specs (apart from I have 512 RAM) and the same card. And San Andreas on PC should work fine. Half Life 2 works perfectly with full on specs and 4xAA. But since the G4 MX440 is only a Direct X 7 card, it looks like crap without drawn shadows and water reflections.
Should be upgraded to a 9600XT and 1024 RAM before SA hits the PC though. I'd also suggest you upgrade the card and RAM. As most games now only support DirectX 8 and up and are looking like they'll soon be using over a gig of RAM.
Go with it for PC if you can upgrade that RAM. If not, get it on the 'box.
I've had one of those GF4 MX440' 64MB before, and I think you'd be fine playing SA. There may be a few points where the performance may be a bit sluggish, but not bad, you can always upgrade your computer later too. Plus, the PC version will be able to use mods and will be better looking even with a less than perfect video card. I vote yay for a PC purchase.
wow guess everyone beat me to it.Yeh i'd say go with the pc version 2 cuz u could always upgrade ur ram and video card later.I have those same specs except more ram and some1 told me the game will look as good as the xbox version if not better on my pc.Dont know how true that is. Hey what do you guys think of the geforce 6200,thats the one i wanna get.