If you're frugal, I think the Biostar T-Force boards are a good bet. They don't all have two PCIe16 slots so most of them can't do SLI, but I have no need for SLI and maybe you don't, either. Here are a few of their options:
TF7025-M2
http://www.newegg.com/Product/Product.aspx?Item=N82E16813138074
TF7050-M2
http://www.newegg.com/Product/Product.aspx?Item=N82E16813138061
Both of these boards are very similar and each are used by at least a few members of OCForums. They are nicely overclockable microATX boards that should reach decently high HTT speeds for overclocking. They are both inexpensive (70 and 80 bucks, respectively). I would really like to build a microATX gaming rig, and I would ultimately use one of these two boards. Perhaps a few owners can chime in.
BIOSTAR TF560 A2+
http://www.newegg.com/Product/Product.aspx?Item=N82E16813138081
BIOSTAR TForce TF570SLI
http://www.newegg.com/Product/Product.aspx?Item=N82E16813138059
These are full-size ATX boards, both very overclockable and full of useful features at a very low price. The TF570SLI also supports SLI if you're into the whole dual-GPU thing. On the downside it also has a tiny fan for the southbridge cooler which is supposedly very annoying. I personally have no use for SLI so I would stay away from this one unless I could find a southbridge cooler compatible with SLI and 8800 cards. Again, both of these boards are inexpensive at $80 and $87 respectively. I'm not sure if any OCForums members are using either of these boards.
Biostar's TForce boards are capable overclockers at extremely competitive prices compared to the "elite" offerings from ASUS and EVGA that operate in the $250-400 range. The downside is, allegedly, the instruction manuals, availability of customer service, and lack of useful BIOS updates. If you're computer-savvy enough to bypass manuals and customer service, then Biostar looks like an excellent choice for budget overclocking builds.
I would like to point out that I'm not a shill for Biostar. I've never used any of their products. My current build is actually an ASUS board, and I love it. But Biostar's products do look VERY nice for the price, and that's why I suggested these boards to you.
The bottom line, however, is that there is no One Best Board for your 6000+. Any decent overclocking board from Biostar, Gigabyte, EVGA, ASUS or any of the other manufacturers of enthusiast boards will perform well with that chip. If you had a larger budget for the board, I'd recommend something from a different company.