Vortech = Ferrari. Top shelf, super premium. Sometimes a little finicky, but it's more about the passion of the hobby that drives you to get one.
Tunze = Porsche. Strong upper mid-range. Super reliable. Spend all day at the track, then drive home. Phenomenal customer support as well.
Koralia's = Corvette. The trim pieces are a little brittle, but they will always get the job done. More then enough power to muscle with the big boys.
Maxi Jet Modded = Mustang with a blower. They squeak, rattle, and roll. Decent in a straight line (tons of linear flow), but not the best when you want control.