What's your intended use for the system?
If it's for gaming, and you're not anti-Intel, I suggest pricing out a system based on an Intel I5-2500k with a P67 or Z68 motherboard. It might be slightly more expensive, but not much. the 2500k has an unlocked CPU multiplier, so it's easy to overclock above 4GHz. The Intel "Sandy Bridge" CPUs give a significant leap in performance over the first generation Core I3/I5/I7 parts.
Maybe the forthcoming "Bulldozer" AMD CPUs will change the performance landscape, but that's unknown at this time. (It'd be nice to bring back the days when the Athlon64 was the chip of choice over the Pentium 4, but I'm not hopeful.)
There may be some applications (probably not games) that would benefit from the 6 cores in the Phenom II X6, but even there the I5 should be competitive.
I've had poor luck with LiteOn drives. They didn't last long. Maybe it was just me. Asus, Samsung, and Pioneer drives have been OK.