I had a sitex sp 80 for 10 years and never had one problem.They are around 1500.00.You will need a solenoid vavle if you have power steering,theres another 700.00 from marine hydraulics.The sp 80 is easy to use ,I never had it interfaced with any other electronics,I just wanted the boat to go in one direction.
Simrad is our #1 choice in pilots; most reliable, highest level of support. ComNav does make a good pilot, but the product support isn't what it used to be, and being based in British Columbia it takes a while to get replacement parts. The Raymarine Wheel Pilots are really only meant for sailboats, and the SportPilot was a disaster. Their new EVOLUTION pilot is supposed to be a game changer, but we're waiting on some more feedback from the field before we start using them as an option, as they use a totally different method for autosteering with their 9 axis gyro. I'd stick with a Simrad AP28 w/ an RC42. If you have some questions, give me a call at the office, 914-235-4023, or send me an email by clicking on my screen name and sending a direct mail. Things are a little nuts here for me to keep up with PMs, but I'll be happy to help point you in the right direction, but I;ll need some more specifics on the steering system.
-Chris AKA WHarf Rat
The SiTex 36 is actually a rebranded ComNav. The SP110 and SP80 are built by Si-Tex on their own. The SP110 we use mostly on outboard boats and smaller trawlers, as it does not have a second station option. and the 80 on some work boats that don't need some of the features of the AP24/28. Si-Tex has some great support, right up there with Furuno.