Dude, props to that! I think too many people think you have to have a good computer to edit, but if you are pulling it off with a PC and only 1gb of ram then DAMN!
Good computer helps, no doubt there. But someone mentioned above that you should go for 8gb of ram, I wouldnt, thats $1000 extra, not worth it IMO, put that money towards software or get a faster processor if anything. I just got one of the 15" with the 2.8ghz dual core and 4gigs of ram, and a 7200rpm HDD, its easily fast enough. And I know my boss has the same computer and is editing all RED footage on it and doesnt have a problem with it. So for me its probably somewhat of an overkill.