I would recommend Thule products. Not cheap I have to say, but very well made.
Tip : Opt for the more expensive aero bars over the std square shaped ones, The aero ones don't make horrible noises when traveling at speed.
I use two of the Outride 561 bike carriers. These are the ones that you have to remove the front wheel and the bike then attaches to the carrier via the forks.
The beauty is also that you can keep the aero bars and carriers and just buy new roof mounting adaptors when you buy another car....simples init!.