Hey guys, I know this has been covered in other threads and i have searched a decent amount. Anyway, I have a 2007 2.4 Ghz aluminum iMac with 1g of ram. Should I spend 20 and double the ram at 2gb, or max it out with 4gb? I really don't have 80 bucks to shell out for the 4gb, but I was wondering if upgrading to 2gb would be noticeable/worth it. Thanks a bunch!