I picked up the 17" 1GB iMac w/ a free printer and also bought a 20 in. Dell ultrasharp widescreen monitor for it. Im going to be using this for LOTS of photoshop work, and I already have a pentab. what else should I pick up? this is my first time buying a mac. any good books on macs? any periferals? also, was this a bad time to buy a mac?