I'd go the PC+Emulator route since that will open up PC games as well, like the Left 4 Dead series. Plenty of options to deal with zombies in those games, like chain saw, gasoline, cricket bat, and katana. The Wolfdale Core 2 rig mentioned in the above post with the GTX 650 or 750 ( Maxwell-based ) would play that game fine. I played that game fine with a 560ti.
Denon AVR X7200WA, Emotiva XPR-5, Emotiva XPA-7, Sony XBR 75" 850C, Oppo BDP-103D, Roku 4.
DefTech BP7000SC (L/R), CLR3000 (C), SM55 (FH), UIW BPZ/A (SB), UIW 75 (TM).
JBL L7 (Sur), EoSone RSR 350 (RH).
PC 2.1 setup. Emotiva Stealth 6, SVS SB2000 sub, Emotiva DC-1 DAC.