I was planning for 5.1 with the budget almost the same.
This is what I've planned:
Onkyo NR808 ~7.2K
Monitor Audio Rx6 (front) ~10k
Mirage OS3 (sur) ~3.5k
Mirage OS3cc (center, due to size, you can get a bigger one with around the same price) ~2.8k
Sub-woofer around ~2K, lots of options.
I choose this sets of front speakers because I wanna listen to music as well. If you're not really into music, just wanna watch movies and play games, you can choose others cheaper front speakers, and go for 7.1