Firstly, stick to your existing rig. Prices on Core 2 CPUs have nowhere to go but down because of Core, and AMD will be rolling out 45nm Phenoms, hopefully sooner rather than later. If you must have the ultimate in gaming equipment, though, you were obviously considering the 965XE anyways. That is the best Intel chip, even for gaming, albeit not by much.
Scrimping your way into the i7 club with a slower 940 or 920 is a bad idea. These chips don’t just suffer in gaming because of their slow clocks; their memory controllers are only rated for 1066. That’s not even as fast as top-end DDR2 memory, let alone DDR3. Though the overall memory bandwidth of i7s is better than any Core 2 despite lower speeds (because of the architecture changes), the benefit is hampered slightly by the slower memory.
Should you need a new rig and can’t wait for Core to get cheaper or games to multithread better, the only circumstance that dictates an X58 platform purchase is if you can afford a 965XE to anchor it. Again, don’t bother with its lesser i7 siblings. If you can’t swing a 965XE; stick to a Core 2 platform similar to the one we recommended to the amateur video editor in the last article, save one change.