I've had great luck with my Sig Pro SP 2022 in 9mm. It is accurate, has a smooth DA/SA trigger, great sights, good balance, is a breeze to field strip and can be found for under $500.
I purchased an FNP-9 for my wife. We both liked the gun a lot, but we both preferred the Sig. It is just a better gun.
Ironically, I sold our FN to a guy for IDPA.
The CZ 75 SP-01 is an excellent 9mm as well. The S&W M&P and Springfield XDm are excellent guns too.