>>280688962
I wouldn't call it top of the line, but it should run okay. You could try overclocking the CPU and GPU a bit to get a little more out of it for now of you're comfortable with that. I'd at least start looking for a GPU upgrade soon since you could always just use that in a new computer later if you decide to upgrade everything.
>>280689872
>But that's not compatible with my current processor, if I understand correctly. Is that the case? 
As long as your power supply can handle it, you'll be fine. You might bottleneck in some games because of your CPU, but that won't keep you from running a new graphics card.
>From my (limited) research I can't very easily upgrade my CPU. That requires a whole new motherboard
For any substantial upgrade it will. The best you can do in your motherboard is a 4790k, and I wouldn't both upgrading to that.
>>280692065
>if I wanted to get a whole new CPU I'd have to sell that RAM
You'd have to get DDR4 RAM unless you're just upgrading to a 4790k. For a big CPU upgrade you're looking at replacing the CPU, RAM, and motherboard.