Since you are trolling I'm going to reccomend Cobra. Cobra is accurate to within 1cm when used as a plumb bob attachment on survey grade GPS equipment. The maps are always up to date when you use the paperweight option on real road maps.
The best part of all is that Cobra GPS are dirt cheap. You can find them on the bargin bin of a lot of retailers. Naturally the hardware options that make them so good are always ready to go, and do not depend on firmware.
What about a Cobra 100? I heard that it was trash!