I have an Explorer. It weighs only 40 pounds stripped of gear and hatch covers. I got it so I can easily lift it when transporting.
Both the Navigator and Explorer are tippy. This is because the seating position is too high. It's since been redesigned for 2007.
If youre buying a used yak, its hard to beat both for value. I got mine for $ 200 almost new. I'm learning on it, drilling holes with absolutely no care in the world and having fun
As for buying a new one, I'd look for better design. Ive seen Jeff's Prowler 13. If I wasnt trying to get a pedaling yak, that is what I'd get. A wet ride has its advantages in high wind.
/bing