I think highly of the P99/SW99 series of guns. The .45 caliber version is a great polymer, striker fired, commander sized, quality, reliable, accurate, 9 + 1, DA/SA gun with a decocker. If that's the kind of gun you're looking for, the SW99 .45 for less than $400 would be hard to beat.
The only thing negative I have to say about mine, as gmchenry pointed out, is that it seems like the mags should hold more than 9 rounds.