K-mac's isn't even available yet. It's been in the works for over a year now. I keep pestering them about availability. Haven't gotten any response since January.

FYI, their's are supposedly going to be fully adjustable, camber and caster.

 

Cusco makes a decent A-arm for a reasonable price. Availability is limited due to their newness. The only problem is the range of Positive camber is very limited...I think only 1/4 - 1/2 degree.