The very first suspension modification we will be talking about in this 3 part saga is adjustable front upper control arms. This happens to be the only part I would recommend replacing even if you want to keep the car relatively stock. This is mainly due to the fact the B7 has no way of adjusting the camber from the factory. Therefore without adjustable control arms, if your camber is off and starts heavily wearing your tires unevenly, there is no way to fix it without replacing the upper control arms.
In terms of pricing, most adjustable upper controls arms will cost about $500 for all four with one exception; adjustable bushings. Most of these brands can be found on ECS Tuning as it’s pretty much a one-stop-shop for the B7 platform.
034 Motorsport makes two types of adjustable upper controls arms for the B7. Both are around $500 except one is made for lowered vehicles. The difference is the ones specific for lowered vehicles are spherical and smaller in diameter.
The only exception for getting full replacements is adjustable control arm bushings. They will essential allow for the same amount of adjustment, however, they use the factory arms. So if yours are blown this may not be a suitable option for you. But if your stock arms are fine, POWERFLEX makes a kit for $215.
At the end of the day, if you can find a reputable company with a lifetime warranty, buy them. These are just my recommendations for reputable companies.
-Devan