Mining Scrypt with my GTX760 at 330KH/s ^^" Good old times!
QUAD r9 270x cards, i think I mined scrypt for a few months before the ASICS took over, then mined X11/X13 for a bit until converting it to a dual-270x (in crossfire) gaming rig and selling one GPU.
Didnt turn a profit, but i think I paid ~$1200, made $200 selling a card, and mined about $400 in coins, which basically just gave me a well-priced gaming rig. However, Im already about $50 mined in ethereum, so its still valuable for mining