For the owners of a uMBP with switchable graphics, how often do you keep your 9600 GT on and what kind of tasks do you use the GPU for? I got the mid-ranged 15" model for the 9600 GT but I can't see myself using it until the release Starcraft II...and even after I have my desktop with an HD 4870 1GB. Do any of you regret purchasing the model with the 9600 GT?