So, I'm trying to decide if I should buy a new iMac, or just upgrade my old one. I've been trying to sell my Power PC G5 on craigslist for almost a week, but no takers. I even included CS2. I was hoping to get at least $400 for it so I could put the money towards a new one. My iMac has 1.8 GHz and 512 MB RAM and a 150 GB hard drive. I'm still running on 10.4.11. Is it really worth it to buy a new iMac? or should I just add some RAM and upgrade to 10.5? I just installed CS4, but I'm afraid that my machine won't handle it well. thoughts?