Carl,
I don't think I'm going to be much help here, but I'll try.
I've got the five section Unger aluminium pole; Cleantech definately sell them. When (if) you purchase make sure you order some spare collars (cleantech will know what you mean) since they wear out every four to six months. The collars are just a few pennies.
I use a ten-inch Ionics residential brush and hose; but I bought these second hand from a local window cleaner who gave up his round. I suggest you find a phone number for Ionics and give them a tinkle; but to be honest; I suspect Ionics don't really want to know unless you're going to spend lots of cash, but it's worth a try.
However, getting the Ionics pole-hose, in my humble opinion, IS REALLY IMPORTANT, since you can easily conserve water by just nipping the hose to stop the flow. Since the pole hose is outside of the pole, you can just grab a handy length and hey presto; the water shuts off.
Other pole hose may not be as effective.
Oh; make sure you get an adjustable goose-neck too. I recently helped a local window cleaner get set up with a backpack system and he ended up with a fixed goose-neck and I don't think it's much cop; although I haven't used one.
I've also heard that the cheap Cleantech pole is really good and since I hope to go van-mounted shortly, I may purchase a couple of them.
I hope I've been some help.