Hi Kevin, and welcome!
As everyone stated already:
1. Your receiver should be fine, unless you're listening to very high levels for extended periods of time.
2. EP 125 won't do much for you with M80s; I've tried it myself.
3. Do replace you current wire with 14 gauge (or even 12), especially if your speakers will be more than a few feet away from the receiver. It shouldn't be very complicated since you have the wire already; just tied them up at one end and pull from the other. The cost should be reasonable as well.
M80 v3, 2 x Emotiva UPA-1 Monoblocks, XPA-5, UMC-1 PrePro
Pro-Ject RPM Genie, Carver C2 Phono Preamp