My last Jetta was lowered about 2 + inches. Not slammed but pretty low. I had a tie rod end get taken out by a puddle one day. I know this because I had checked it 2 days before and it was tight hit a huge puddle and it was loose. So that just goes to show you parts can go from good to bad fairly quick. When you lower your car you change the geometry that the suspenstion parts are designed around. As far as brands go, I like Moog.
moog joints only lasted me a year in my car ..... and i replaced them twice with moog joints ( a year with both sets ) . i put in some really cheap italian joints ( like 12.00 each ) 2 years ago and they are still really tight , aproaching 45,000 - 50,000 km in total on the italian joints . maybe 7,000 - 10,000 km on each set of moogs .