I have bought the P8P67 Pro Asus motherboard when I decided to build my own PC a few months ago. The key reason for considering the P8P67 series was their compatibility with the i2600k 1155 socket processor which I chose as by far the best option out there.
Having chosen the processor, you basically have two choices thereafter: manufacturer of the motherboard and the stuff you want your motherboard to have.
In terms of manufacturer, there are two clear choices - Asus and MSI as well as a few budget brands and a small number of very high end (read expensive) ones. I picked Asus for their known build quality and given that prices were very similar. Today, you'd expect to pick one of these up for under £150 which is a good price on a top quality piece of kit.
Your next choice is the type of board you get. There are all sorts of types ranging from the most basic to the Deluxe version. They are mostly the same, but you have to look at the fine print in order to determine the key differences. When you get the PRO board, you essentially get everything any sane person would ever want with full HD support, USB 3.0 & all the ports you want including SLI/X-fire potential (although beware that if you buy particularly large graphics cards, you will only be able to fit one of these onto the board (e.g. one with big fans) - the second one will have to have no large cooling when you come to link them). There is virtually nothing (read: extra languages, etc) available in the Deluxe version that you would ever need, so save your cash.
The BIOS of this system is particularly good with lots of options and very easy overclocking and set up using a graphical interface. This is one of the best available and definitely far better than the competition in the 1155 socket motherboards.
Overall, I would highly recommend this board if you are going for a Sandybridge computer build as it offers everything you would want, is reliable and has a great BIOS for a reasonable cost.