Clownshoe is the way to go in Dallas. Ask for Jeff. Mpowered is just butthurt over some forum beef from like 5 years ago he holds onto like herpes. Jeffs prices are more than fair and his work is quality. He's worked on my e36 M3, X5 and e28 and stands behind his work. I've sent friends and family to him and he has a loyal, mature customer base.
FYI Eurosport diagnosed my 911 with weak lifters in 2008 when the engine suffered a total IMS failure so take that for what its worth.