Looking to see what would work best for a upgrade that would last with no need to upgrade for 4 or 5 years.. trying to find something 300 or less, kinda tight on funds, my build.. I5 6600k 3.50ghz four core cpu, 16 gigs of ddr4 ram, older radeon r7700 HD video card and a Asus xonar DX audio card, Asus z170 AR series motherboard, corsair h110i gtx liquid cooler and a 600 watt psu