I'm in the market for a second hand G5 with Applecare. I will be using it for my recording studio as I'm sick of PCs. There are some great deals on eBay and my limit is looking around £1000. I don't understand the different specs, some can take 4 gig ram, some 8 some 16. Some are Dual Core, Dual, Quad. Which is the most powerful? What's better Dual Core or Dual CPU (I take it this is right?) I have an Athlon 3200 XP 2.21ghz with a gig of ram right now. What Powermac G5 is similar to that speed? Any help is appreciated. Also, anything else I should look out for when buying a Powermac G5? Thanks in advance.