ok, set the multiplier to 5 or somin, and raise your htt up as high as possible to see how far your memory can go with resonable timings (2.5,3,3,7).
Once you have logged how high ur ram can go put the multiplier up to 9 or 10 and start raising the htt with the ldt set at 3x untill ur comp becomes unstable, up the vcore 0.025 and see if it helps with stability, if it doesnt up the vcore again and if that doesnt help then change the vcore back and lower your multi and try for a higher htt.
Ig u got some spare cash hanging around get urself a DFI UT 250gb, i went from 2.3ghz with my asus k8v to 2.6 with the 1:1 @ 260