You can buy a 1911 and get an extended, threaded barrel to have fit to your weapon. :roll eyes:
If you have to have one of the best.
HK USP Tactical - Suppressor ready, 1911 based, polymer pistol.
Nighthawk Custom AAC 1911 - Simply the best I have come across. As a matter of fact, it was so good, I bought one and suppressed it.