Hi, unfortunately, your board only seems to support the conroe c2d's.
None of the CPUs listed offer enough performance increase to in my opinion warrant an upgrade. Your best bet would be to keep your current CPU and overclock it as much as possible or if you want to upgrade, you could go for an AM2+/AM3 setup - all depending on how much you want to spend.
The 5770 you have listed is PCI-E 2.1, I've read that some people have had problems with 2.1 in 1.X mobos, but I'm not sure if those problems still persist. I'm sure someone here will be able to tell you.