I've been using the S6070 low profile digital servo in my Touring Car (JRXSR) and absolutely love it. Extremely fast, turned down the servo speed a bit actually. Plenty of torque for a TC. Noisy buy I like that, lets me know my car is on The servo wires are very long which will give you a lot of options for Rx mounting. I did install a Spektrum Capacitor on my Rx, didn't have any issues pre-cap though.

I did have to dremel my servo mount on my Losi JRXSR to make room for the wires but no big deal.

Have a Spektrum S6040 coming in today. Should be even better