Hello,

I'm new as well, might as well use the first post for something

Currently on a HD7950 which gives decent hashrate.
Your planned upgrade will likely give you more than double the improvement though, wiki lists 280x at around 600-700+ kH/s, my 7950 gets 600+

Havnt tried BTC yet, but looking for the hardware, which seems pretty pricey, GPUs just don't cut it