If I had to choose I'd grab the BIOSTAR TForce TP35D2-A7.
Biostar T mobo's have done very well since their introduction often performing the same as boards costing 25 - 50% more. Asrock is not known for thier OverClocking, more thier inginuity and features for the price. Gigabyte is rapidly getting thier name back after their name back for stability after the Socket A disasters they released and they seem to be doing very well with overclocking often beating out Biostar's T series as of late.
Originally posted by: Gillbot
Low budget and high OC goals are a common recipe for disappointment. If you do plan on heavy OCing, research your mobo and see if it has reviews that show good OC success, otherwise adjust your budget for a more OC friendly motherboard.
With all due respect you need to get arround more Gil, my TA780G ( $90 ) and 4850e ( $66 but launched at $90 ) is currently giving me 3.2ghz on the CPU with 0 issues at the drop of a hat. Odds are I'll see 3.3 - 3.4 outta this chip on this mobo as my CPU Clock only has to reach 264 or 272mhz in my case with my 12.5 multi.
What I have here would be considered a budget machine as both only cost me $150. I coulda gone one better and got the TF720 and the 4050e for $136 and gotten at least 3.2ghz though due to MB limitations on average been stuck arround 3.2ghz max.
People have spent less than what nano will have considering he went with a $90 CPU making his combo $180 - $190 and gotten stellar OC results with the same ammount or less money.
My 2 cents worth