I guess it depends on what you want to do with your car. I would say go adjustable. There are plenty of articles around on how to adjust them. If I remember right there is and article on steeda's sight on doing pinion angle.
If you are planning on a lot of strip time adjustable would be the way to go so you can fine tune your ride.
If you are like me (No strip time) then I would get a nice pair of non-adjustable control arms and call it a day.
TIP: To start out with your adjustable control arms at or near the factory specs, measure from the center of the bushings on a stock arm and then adjust your "adjustable" lenght to the measurement you took off the stocker...