My lowly, cheap, two year old 442 is among the finest guns I own. Save for the typical aluminum flashing around the barrel (which was easily removed), it is perhaps the most flawless firearm I have ever purchased. There are several hundred rounds through it and I hope it lasts forever. I'm considering a 642 as well. The 442 frame finish is known to be more durable, while the 642 should be more rust resistant.
The "Deep Cover" guns come with a pretty slick action but are too gimmicky for my tastes.