I went with the fastest version of the 13" book and upped it to 4GB of memory from Crucial. ~$2,100 after all is said and done, including wireless mighty mouse, case/bag, remote, and adaptors.

In-game on my main I have all usual graphics settings bottomed out except terrain distance and spell detail due to it being very difficult to see a twinks enchants in BG without spell detail high.

On the alt sessions I have bottomed out everything for graphics, switched to the lowest resolution and even disabled sound. essentially these are micro windows that have been cut to the bare bones.

At the most laggy times in Org i still get about 10-15 FPS. On the main session I still get good resolution and decent detail.