I love my S&W Sigma 3k+ rounds through it and replaced an extractor spring just before 3k. It is $450 new and they are running the program where you get an additional 2 mags or $50. I use it as a primary carry and IDPA gun, being poor and unable to spend big bucks. It is available in 9 or 40, and I have heard that the Sigma F series(pre ban) magazines (16rds) fit the current Sigma G series.
Used one here for $350
http://northeastshooters.com/vbulletin/showthread.php?t=76982&highlight=sigma+WTS
Used one here for $350
http://northeastshooters.com/vbulletin/showthread.php?t=76982&highlight=sigma+WTS