Looking at buying this system from Apple for a pro audio workstation... Would be an upgrade from my Late 2008 2.8GHz Core2Duo MacBook Pro. Don't really care about graphics, just hard drive bays, RAM, reliability, and processing power. Does anyone have experience with a refurbished Mac Pro as per the quality? Also, does Apple generally upgrade the refurb'd offerings when the new models come out? Unsure if I should wait til the fall because about $2,200 is all I'm willing to spend on the base system before upgrades. Thanks.