Some things for you to ponder:

1. the M3 will sound better than the M2.
2. the M5HP will sound better than the M3. You can get it in an on-wall version.
3. Forget the 180. The 160 is a must and it will not leave you wanting a 180. This will free up some cash.
4. You will never know how bad the Klipsch is until you get the EP500.
5. If money is tight, defer the atmos speakers. Trade in whatever you have for a pair of M5HP for front, a VP160, an EP500 and M3s for the rears.
6. Ask Ian if he can build you an EP500 in an NME version. I expect he'll do it no charge if you do this deal.

You'll have an amazing system!
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House of the Rising Sone
Out in the mid or far field
Dedicated mid-woofers are over-rated