The Gigabyte 965P-S3 is a very well-reviewed motherboard at all Tech forums, pretty much everywhere. It is definitely one of the preferred boards at that price/feature point. Many people have it (or the DS3 which is the SAME except has capacitors built with better quality material, to last longer. But it's the SAME mobo). It is tried and true, and has proven itself to be a very good board. It also overclocks very well (not the best, but very well) for its price, and its BIOS is very easy for beginners to understand. It's not finicky any longer with RAM or whatever.
So all in all, the S3 is a highly regarded motherboard, at a very good price. You really can't go wrong with it.
There are cheaper boards, and ones that overclock better, and ones that have more features......but they cost more, or are more unstable, or whatever. So for your best investment of money, the S3 is about as good as you can get, especially considering the price.
As with most things, however, there are personal and factual data that might be offered for other products. For example, someone might recommend the ASUS P5B-E as an alternative. And yes, it is a good suggestion. But some people have complained about that board, or said it was picky about certain things. But it also tends to score slightly higher in benchmarks. And if you get the P5B-E you'll probably do fine, and alot of people have.
I've personally owned ASUS and Gigabyte, and I definitely prefer the Gigabyte for the reasons stated above. It is the safest choice for the best price, with the best features and stability. It's really that simple.
But as I said, there are other mobos that can be suggested, and they're not WRONG. They are just different, or have nuances that might make a difference to certain people.
But you would be hard-pressed to find someone here that won't agree with the S3.
Hope that helps clear it up.