Lue, what is your goal for the car?
The least expensive for lower is to make your own.
If you box the stock ones properly (wrap the filler piece around the end) and install Poly bushings you will have all you need until you start making killer power and am trying to tuck a big tire.
No "need" for adjustible lowers.
Even if you can't weld, making the filler is easy. Take it to a welding shop and 20 minutes later you have boxed arms.If you go this route, there are a few tips/tricks I can share.
Here are mine in process, they have an extra piece for the aftermarket sway bar.
Notice the extra flap on the ends that will get wrapped and welded.
Done and looking pretty.
For a street car, I just use stockers with poly on one end and rubber ( Camaro) in the rear housing.
Adjustibles up top are a good option. Allows you to set pinion angle. Pinion angle should not be much of an issue at stock height and performance.
Also if you get upper adjustibles, make sure they have grease fittings for the bearing/joints or you will be replacing them often( assumes you drive it alot).
On my Wagon, the lowers are pictured above.
The uppers are stock unboxed with a Camaro bushing in it. I "want" it to be able to flex and not bind when turning.
I went this way on the upper because the anti-hop bars eliminate the housing bushing.If I did not have the anti-hop it would have gotten bushings (2 rubber,2 poly) like I said above.
Hope that helps.