Heya,
SATA 6Gb is pointless to even mention. You need a drive that is capable of saturating even today's current SATA 3Gb channels. Only the top SSD's can do it right now and even then, only just. Worry about this in two years when SSD's are more common place and way faster than they are now. Normal HDD's simply do not come close to even filling SATA 1.5's channel, let alone 3. So this 6 channel, well, don't hold your breath. It's like having 10 cores in a CPU and nothing that actually can do anything with it that is practical.
USB3 is actually a neat thing. USB speeds are no longer good anymore for today's devices. eSATA is great. But if USB3 can come along and essentially just be an even easier to use, universal, same-practical-transfer speeds as-eSATA then it's a good thing. But you can add it as a card too. No need to wait for a motherboard with this.
GPU's have gone up. Yes. But not by a tremendous amount. It's not like they're double. A $20 raise in price for that one card you're going to buy isn't the end of the market. The HD4870 in the $150 range is still a great buy, as is the HD5770 in the $160 range. The GTX260 is also in that range, unless you get the 216 version which is closer to $180 right now. And of course, the HD4850 and 9800GT are both in the $100 range, should budget demand. Less than that, and well, an onboard IGP can pretty much do it so don't look for something discrete.
CPUs are stable as hell price wise. Intel hasn't dropped prices on their oldy goldies hardly at all. Q6600 and 9550? Still nearly the same price after years. The new stuff? Only a few bucks more. I mean, that's ridiculous. You clearly should be buying new stuff. These prices are nuts for what you get today. Our CPU's are so far ahead of what we even can use it's just silly. No one needs server grade i7's right now for home, especially not gaming and all. These CPU's are cheap for what they actually are. Quads in general are cheap for what they are. Now is a great time to buy a new mobo/Quad. Both Intel and AMD.
Very best, 🙂