Ok, i recently traded my old 20 inch imac for a 13inch 2.26ghz 2gb DDR3 9400m macbook pro unibody. I like it alot and its been helpful when designing on the go ... but then Valve opened the gates of heaven for me and announced steam for mac launching next month. regardless, a guy is willing to trade his 15in 2.4ghz 2GB DDR2 8600g 256mb aluminum macbook pro for my unibody. Plus it comes with snow leopard which my unibody doesnt have (just leopard). Everything seems to be an upgrade, including the L2 cache from 3 to 4, for me other than the bus speed of the memory. In your opinion is this a good trade for me just to get better gaming performance when steam hits mac like a fireball to the face? Should i keep my 13inch 2.26 unibody and simply double the ram to 4gb DDR3 ... Or trade for the 15inch 2.4 aluminum with the dedicated graphics card (and double the ram to 4gb ddr2) ... Need some good advice from fellow apple and gaming enthusiasts. Thanks for your time.