This is slightly offtopic, but being the "unofficial" nvidia mining thread, I'll post it here anyway...
I'm kinda in a crossroads now, thinking which path to take.
I started mining and trading with the idea of upgrading my gear once I reach a certain amount of BTC, to prove myself it can be profitable before investing more. I have reached the amount now, and I have handful of options now.
1) Buy a new, complete computer for a mining rig
I don't like this idea at this very moment, the investment is bit too high
2) Upgrade my current computer part by part
   2.1) Upgrade using another Nvidia - this would be simple really, since I already have an NVDIA gtx 680
   2.2) Buy top-of the line AMD GPU - would probably double my hashrate, but would leave my current NVidia useless - and somehow I've grown fond of the Nvdia and cudaminer :p
I'm leaning on option 2), I need a better PSU - 500W stock just ain't good enough.
Any ideas on this?