My suggestion would be to visit the manufacturer and see how they help you now and how they can work with your architect and how easy it is to get replacement parts. Each of the companies you mention have been around for a while so track record is good. See some washes, see some installs because good equipment can be installed poorly and cause problems. See an install from who you plan to buy from - that is a big deal. Personally I like stainless equipment over aluminum.
This is excellent advice and what I have been doing over the past few weeks. I visited a MacNeil tunnel in Northern Indiana and flew up to the Detroit area and viewed about 6 Peco tunnels. I ultimately decided on Harrell's in Indy. They will be installing MacNeil equipment in a new 110ft tunnel/4 bay Lube Center I'm building this summer! The main factor for my decision was service after the sale. While I have a few years of Inbay/SS experience, I have NO tunnel experience and want a Distributer close by. Both manufactures have good equipment IMO. I'll start a thread and post pics once we break ground. -Kevin