What type of vehicle are you mounting the rack to?
I spent a few months researching the differences between every common rack out there. My roof had no rack or mount points so my reserach included a new base system. Then again some manufacturers use the big companies to make their OE kits.
I agree with the Guy above me, you OE racks might suck, but at least you have something to work with. I was thinking of going with a discount model on mine but figured I would be better off with something in the middle of the product line. A little more money for some extra piece of mind was worth it to me. No matter what my bikes cost I would not want to loose them on the highway, that just sounds like so much liability. $20/ea for legs is about what they cost…as a 1 time expense (to me) it was worth the investment knowing their is a quality item up there. So far I’ve been very pleased with mine, I’ve driven hours with bikes up there and several times a week and have only had to tweek the adjustments once of twice (but I am also ocd).
If you haven’t yet checked out http://www.rackattack.com/index.asp? you should they will pretty much lay out all the options for your car, with the exception of hitch mounted setups for that I have been referring people to http://www.etrailer.com/ for a few years now and have had great success with them.
A quick few words on what I went with.
I have the Thule 480 traverse (square bars) with the ferring and two Thule 517 Pelotons. It wasn’t the cheapest setup but I do not plan on buying another for several years. The ferring keeps wind noise to a suprising minimum I am very happy with it.
Happy hunting.