The TST 507 is a great choice, but there are other great options as well. My only complaint with the TST system is the external antenna design of the receiver. Not only does it look bad when compared to the clean look of an internal antenna, but my then 3 or 4 year old son broke it off within seconds of me taking it out of the package (obviously not TST's fault). Luckily I repair electronics daily and it was no issue for me to repair the circuit board where the antenna connector mounts.
'04 GMC Sierra 2500HD, CCSB, D/A, MaxBrake, B&W Companion, Retrax Pro, AR Power Steps
2013 Rockwood 8289WS w/Diamond pkg
1969 Camaro RS/SS Convertible
Dad's old 1968 Empi Imp (recently recovered from under 21 years worth of boxes/dust)