What to upgrade!?

[Dcky]

So, my current setup is GPU: Gtx 1060 6gb, with CPU: intel i3-8100, and a 1080p 75hz monitor.

I have around £500 to spend, give or take, and i am looking for some advice for what to upgrade.
My possible options i was thinking of are:

i5-8400 (or maybe 8600??) CPU + a 1440p (depending on whether i can run it) or 1080p 144hz monitor
OR
i5-8400 (") CPU + Gtx 1070 mini 8gb and no 144hz monitor
OR
any other suggestions?

I am curious as to whether, with a gtx 1060 and i5-8400 i can run games at 1440p 60+fps
, or whether its better to just get a 1070 and i5-8400 together and keep my plain ol' 1080p 75hz monitor.

Any comments or suggestions are appreciated

 

[Dcky]

So buy 1070 for £300, sell 1060 for £100, and get 1440p 144hz monitor for £300? The one thing holding me back from getting a 1440p monitor which i really have my eyes set on, is my cpu gpu combo, do you know of any issues with the 1070 and 8100 together?