>>264280436
Was going to suggest just upgrading the graphics card for now, but that processor might be a problem if you're only running it at 4.1.

Depending on part prices, you could probably swing a kinda future proof rig and an Index within your budget, but you're probably better off just dumping more money into the computer for now. The Index is better, but not really $600 better, so it's hard to recommend to someone that's new to VR.
>>264281143
>I take it 6dof is the standard now if I spend anything decent?
Yeah, but every available PCVR headset right now is 6DoF, so you don't have to worry about that.