If you want something specing out, just post your budget and what you need from that.
However, I'm waiting until AMD's Zen CPUs hit market (looking like Q4 this year) before deciding which way to upgrading my 6 year old i7 930.
If you want to wait, but also want to grab some upgrades you'll be able to roll into your next rig in the mean time, then an SSD (120/128GB suits most people) for boot and possibly another +250GB one for any Steam/Origin/Uplay games etc that benefit from faster level loading (e.g. Fallout 4, Dragon Age)