It all depends on what you are planning for the future.
Every board would be sufficient.
if you want to upgrade soon or maybe add a 2nd gpu i would reccomend a board with a lot of pcie slots (1x,4x,8x,16x doesnt matter)
However if you just want to mine with one gpu, maybe a mini-itx board is a better coice. (this due to low power cpu's)

here are some sites which can help you:
hashrates:  https://litecoin.info/Mining_hardware_comparison
calculator:  www.coinwarz.com

btw. i would really reccomend the hd 7850 its like 10x as powerful as your current card

hi guys,
i have a spare firepro v7800 laying around and i consider to use it for mining.
Sadly i cant test it right now.
Does anyone know what hashrate i can expect?
thanks in advance

so....
what would be a better investment?

hello everyone,
I recently saw a site called cex.io which claims to sell bitfury chips.
It also says that when you buy a chip you will get instant hashing power in the private ghash.io pool.
due to low fees ($0.001 per ghs/h) im not sure if this is a scam site or not.
I would like some feedback on this site before i invest my precious money in it.
any help would be appreciated

i totally agree ot that^