We are adding sign making to our screen printing business. Our graphic artists have always wanted MACs and now our Sign guys are piling on. Naturally, they want the latest and greatest MAC PRO, but i don't have the budget for that kind of gear. So, i have been on Craigs List and EBAY and there are a lot of G4 DeskTops that are very fairly priced. Do they have the horse-Power to run the entire CS-4 Suite? Can we upgrade RAM and/or graphic cards to make the G4 Generation work? if G4 will not cut it, what is the lowest MAC configured PC that we can purchase. We plan on getting 3 or 4.