In an earlier blog posting I briefly wrote about the an alternative K-Member made by Cap-Auto. Since that time Cap Auto has been bought out by QA1. QA1 has a good reputation for quality and a number of companies use their adjustable 2-way and 4-way shocks. Although tubular upper and lower control arms are available from QA1, they have not yet released the Cap Auto K-member or a redesigned K-Member.
You can see the control arms here:
http://www.qa1.net/qa1_motorsports/drag-and-street/suspension-components/control-arms/mopar-control-arms.html
You can see the coming soon page for the tubular K-member here:
http://www.qa1.net/qa1_motorsports/drag-and-street/suspension-components/k-members/mopar-k-members.html