HI. Got a great reply to an earlier question. Thank you Cory Cooper. Unfortunately I'm technically a bit weak. I'm buying a new iMac and do almost 80% of my use as Garage Band. I perform music and make and sell CDs from the stage. The rest of the time I do word processing as a freelance writer. Graphics are of no real concern. If I buy the 21.5" with a 2.3ghz and dual core 1.5 is that sufficient for Garage Band? Hz speeds, Core ????, etc. I don't understand. Will this low price iMac do the job?