Recommendation for wiring contractor in Scottsdale, AZ

We have a need for a DS-3 extension (734 duplex co-ax, 300 foot run, BNC termination) in Scottsdale, AZ. A recommendation for a clueful wiring contractor familiar with this type of work would be greatly appreciated!

In cases where lengthy in-house DS3 demarc extensions must be run, we
have found it expedient to have the local telco provider (Qwest in
Scottsdale?) extend the demarc. That way the telco is responsible for
end-to-end CSU-to-CSU wiring diagnosis and repair.