EVGA Multiple nvidia geforce 1080ti and 1080 motherboard and gpu bundles
1080ti and liquid cooler for $920
(personally own this one and it 10% faster then founders and runs 15 degrees cooler)
1080 and liquid cooler $690
if you want to offset cost you can earn about 3.25 for a 1080 and 4 a day for a 1080ti using Awesome Miner and Minig Pool Hub doing equihash. You might even break even over a year if its working often (when not gaming).