PSU
http://www.newegg.com/Product/Product.aspx?Item=N82E16817151093
MOBO (if OC'ing)
http://www.newegg.com/Product/Product.aspx?Item=N82E16813157293
http://www.newegg.com/Product/Product.aspx?Item=N82E16813131837
MOBO (if no OC)
http://www.newegg.com/Product/Product.aspx?Item=N82E16813130674
http://www.newegg.com/Product/Product.aspx?Item=N82E16813157303
Thought I'd give you a couple choices.
Since you're going with 2500K (assuming you already have it) I assume you're OC'ing. If you don't already have it, why not get the new Ivy Bridge 3570K? Anyways, if OC'ing you want the Z77 chipset and the ASRock Extreme4 is very popular for that. Otherwise, the H77 chipset saves you some money and the two above are good "bang for the buck" non-OC boards.
On a side note, were you looking for an ASUS-specific suggestion?
The post was located in Motherboards & Memory > Asus > Motherboards section, was that on purpose?
I love ASUS and almost exclusively use them but they can be a bit overpriced in comparison to many others.
The 2nd link I provided for a mobo for OC'ing is the same board I use now, except I don't OC my i7-3770.