Looking to buy an Intel C2E QX6800 or C2Q Q6700

[Fincuan]

I'm looking for a new CPU for a motherboard that's already old enough for shops not to sell compatible CPUs for it. I'm especially interested in the two CPUs listed above, Intel Core 2 Extreme QX6800 and Intel Core 2 Quad Q6700, which are "the best" this board can mount. My current CPU is a Core 2 Duo E6400.

Specs for the motherboard:
Model: MSI 975X Platinum PowerUp Edition
CPU mounting: Socket 775
Compatible CPUs: Full list from MSI

If you happen to own either of the CPUs in the title with Socket 775 mounting, or anything else in the compatibility list that performs better than a C2D E6400, and want to get rid of it drop me a PM or post here.