Brand new you could go for a 380 (2 or 4GB) or a 2GB 960. of those 2 I'd say Go for the 380 unless you have 2 extra Monitors & None of your Monitors have Displayport to Run Triples then go for the 960 as Nvidia Surround Don't Require DP to run Triples & if triples are Possible, It might help Reduce the Bottleneck from the CPU however 2GB VRAM isn't a lot for Triples.
Looking on Ebay, a 290 is the best Option from AMD or a 780 or 980 (if Very Lucky) from Nvidia, would likely have a better chance getting a 770 though:
Gigabyte Windforce OC R9 290, 1 Bid for $109.99, 3 Days 10 Hours left:
http://www.ebay.com/...T0AAOSwzJ5XYVIB
ASUS Direct CU II GTX 780, 4 Bids, Currently at $132.50, 1 Day 22 Hours Remaining:
http://www.ebay.com/...G4AAOSwnFZXXKtc
EVGA Dual Classified w/ ACX Cooler GTX 770, Starting bid of $150, Buy it now of $200, 4 Days 10 Hours Left:
http://www.ebay.com/...vcAAOSwM4xXX~wj
EVGA FTW Gaming w/ ACX 2.0+ Cooler GTX 970, 1 Bid of $158, 3 Days 13 Hours Remaining:
http://www.ebay.com/...cIAAOSwmtJXWiqn
MSI GTX 980, 12 Bids, Currently at $152.50 Reserve not Met, Buy it now of $350, 4 Days Remaining:
http://www.ebay.com/...psAAOSwrhlXT6HB
EVGA Superclocked with Titan Style Cooler with LED Logo GTX 770, Starting bid of $75, 4 Days 2 Hours Remaining:
http://www.ebay.com/...eIAAOSwuhhXVIli
Edited by Lord Letto, 16 June 2016 - 06:21 PM.