Okay, so I was doing some research on my motherboard the other day after a fresh install of windows. I was on the Asus website and in the bios section of downloads they have a bunch of updates for a new list of supported cpu's.
However, I don't know whether these may be bottlenecked by your current CPU, maybe others will have an idea about that.
I am the same way. I don't mean to Hijack this thread, but if anyone knows of an article that discusses bottlenecking Please post a link.
But yet again, I agree. If your current CPU can handle the 6870, that would give you the best performance increase. If the CPU cannot handle the 6870 though, then personally I would just wait til you have more cash to get a Phenom II CPU + a HD 6870. (Strictly personal preference)