I'll upgrade my whole system but i'll be getting a new gpu in the long term..
Throw the word "bottleneck" out of your vocabulary, and throw out the idea that there is a tight relationship between CPU and GPU as to what goes with what.
More important is:
- What resolution and refresh rate is your monitor?
- Does it have GSync, FreeSync, or neither?
- What games do you play?
And, to a lesser extent: Is your goal to maximize frame rates, play at 60fps with max details, or something else?