New Build - Comments?

The Gigabyte would probably be your best choice. If you are planning to crossfire later you will need a bigger PSU.

Since you aren't overclocking and probably not adding a second GPU, you could get by with a Gigabyte UD3R or UD2 also.

With two 4890s?

one of these would do
TP-750
http://www.newegg.com/Product/Prod [...] 6817371022

EA 750
http://www.newegg.com/Product/Prod [...] 6817371026

750TX
http://www.newegg.com/Product/Prod [...] &Tpk=750TX

You'll have very nice performance at that resolution. The balance of CPU and GPU would be a bit off for most games except larger strategy games.

For instance,

AMD 720 BE + 5850
Would be faster in most games, especially with a conservative OC.

That's not to say you are wrong going that route. After all, we tend to swap out GPUs every few years but hang on to CPUs for 4 or more years.