Wait it out. IVB is like a tick++ in Intel's Tick-Tock scheme. Graphics power is still relatively underpowered when compared to raw compute power, and IVB adds significantly to the GPU side of things. From what you describe, I suspect a MBA-class machine would suit you well. Unless Apple pulls off a thermal miracle, a MBA IVB refresh will give you significantly more graphics oomph. Both IVB and SNB should be able to handle Photoshop adequately, but if Adobe takes advantage of IVB's extra horsepower, the performance difference could be very tangible. In short: Unless you need a new computer in the next 6 days, wait for WWDC and then make a decision.