Want to upgrade my computer for this game, need some advice.

[Krindor]

Well, before my current Rig I had an Intel i5 4670k while using the AMD R9 290. Going from the FX 8350 at Max Settings to the i5 4670k at Max setting there was a noticeable difference in congested areas, but comparing the difference while having the game reduce the number of players rendered, there was no difference, visibly.

Even with the lesser Core2 Quad and the GTX 550ti, if I played with Objects Rendered at Medium then it could handle 20-30 FPS at Maximum Eye candy.

I guess here is where our opinions differ, I avoid congested areas as much as possible so having a weaker CPU wouldn't affect me that much while having a FPS lower than 30 in raiding areas affects me a lot more which is why I suggested a GPU before CPU. Though what people seem to forget is that you can add different kinds of stuff to make the look even nicer past the regular max settings if your GPU is strong enough, for example DSR, but at that point the bottleneck might show its significance in even lower pop areas.