I am a daytrader and software developer. I have a white macbook 2 ghz core2 duo with 4 gb ram. I'm thinking about going "pro." From experience will a top end macbook pro 17'' with 16 GB RAM give a major speed boost for the following usage?: 3 external monitors 1 Mini DVI + 2 diamond USB adapters 21'' screens minimum 1680x1050 several java trading clients Windows parallels with yet another trading client multiple browsers XCode Interface bulder Safari, email, skype, ichat, etc... Since a new macbook pro would cost me well over $3000, I would only buy if I get no stutter no beachballs etc... Otherwise I'll keep my existing setup, which is slow but somewhat sufficient. How low can I go with a tradein?