Generally, I think you get what you pay for.
With bridges, I think there are 3 basic types: bent, cast, milled.
There are, of course, indi bridges, but they will be either cast or milled.
With bent bridges (such as the one tjclem linked to) there is really not much to it. You just have to make sure that the bent plate of sufficient heft that it will not be bent further.
Past that, the folks around here seem to prefer milled bridges to cast. And for good reason. When a bridge is milled from billet, it will likely be more consistent in its density, and therefore more consistent in tone across the strings. With cast bridges, there can be "lighter" spots, or even voids within the material. The enormous price disparity between cast and milled bridges involve machine cost vs casting cost. Obviously, a big milling maching will be drastically more expensive than a cast.
I'm really not sure how much of a difference it makes in sound quality, and if it's cheap enough, it may be worth trying out. Even if it sounds like crap or breaks, you'll only be out a few bucks.
That is my thought anyways.