For our first experience towing 4 wheels down, we bought the Blue Ox Avail tow bar. We used it this summer and it was easy to use once we figured it out. It follows well when turning, especially in gas stations where things might be tight.
The price you were quoted is in line with what we paid for our system. If you go to a different brand of tow bar, will you have to get a new baseplate? That could be an extra expense.
A couple of suggestions:
1. If you have trouble getting both arms to latch when hooking up, turn the toad's steering wheel towards the unlatched arm. Drive the RV a few feet and the arm locks easily. Found this suggestion on you tube.
2. While stopped for gas one day I checked the tow bar. The O-pin that keeps the 1/2" pin holding the tow bar arm to the baseplate fell out. The connecting pin was still there but the quick pin was not. We now travel with extra ones of these and will get a lock next summer.