This will be my first mac purchase, I will mainly be using it for music , running REASON and logic on it. I cant help but look at the G5 towers like a 2.4 ghz dual with 4 g ram with expansion up to 16 gb. 1000 fsb per proccessor? vs Imac 20 in 2.1 ghz duo 1 g of ram. which will be the best for me for now and in the future? it seem sthat the price of a tower g5 is great used. but I wonder what limitations i'll have with that over the next few years vs. IMAC? MUSIC Minded!