My current handguns are:
Glock 17
Glock 19
HK45 Compact Tactical
HK USP45
HK USP Compact 40
Les Bear Custom Carry
Les Baer SRP 1.5" Guarantee
Ruger LCP
I can't comment on the FNX, but I've read mixed reviews online. I've owned just about every other conceivable carry gun and I've narrowed my "I trust my life to this gun" down to primarily Glock and HK.
If I were you, I'd save for a HK45 or HK45C. Don't buy a HK45CT unless you plan on getting a suppressor. I bought the Tactical model because I wanted the extra barrel length (for added velocity) but the cost was $300 more than a standard Compact model.