So im buying a new MBP, and im settled on the 15 inch. however, i dont know if i should upgrade from standard 2.53 GHz to mid-tiered 2.66 GHz. Going to college for my freshman year next year, and planning on doing iChat and iWorks programs, maybe throw in some games like sims 3. Is it worth it to pay 250 for the .13 extra GHz? Id like to know if it will increase my computers lifespan, dramatically effect runspeed, and really make a difference in overall performance. Thanx