TrustedReviews have looked at the Gigabyte GA-G31MX-S2 Micro-ATX
A quote from the article:
Gigabyte GA-G31MX-S2 Micro-ATX Review
The GA-G31MX-S2 is absurdly cheap and it'll be absolutely fine if you're building a basic Core 2 Duo PC for your mum. However, gamers, home entertainment enthusiasts and overclockers should give it a wide berth.
Gigabyte GA-G31MX-S2 Micro-ATX Review