I know what you mean about the air/hydro setups bringing the suck, but before you go dropping a load of coin on a whole new bender, did you ever consider going to an electric hydro setup on your existing bender? Check out what I did with my PT105HD; I built the rolling cart out of scrap electronic equipment racks, and built the hydro power pack from a Harbor Freight motor and a second hand hydro pump and log splitter valve. This thing is freaking awesome. It strokes very smooth, and it will do a 90 degree bend in about fifteen seconds. I don't remember how much I have i the whole set up, but it wasn't much since most of it was built from either scrap or second hand parts. The only thing I really regret about it is cheaping out on the casters, before I use it again I'm going to replace them with some much heavier duty ones. I'd also like to add a rack to the under carriage some time to mount different dies to.
The back bone of it is 2.5" square tube, 1/4" wall, which turned out to be overkill, but it was what I had laying around. The cylinder is a cheap common farm type tie rod cylinder, 1.5" bore and 24" stroke IIRC. I think you can buy something comparable from Northern for under $100, and probably cheaper from Surplus Center. This setup will allow you to bend about 95 degrees without having to re-pin the die.
Built the hydro reservoir from a scrap 6" diameter section of pipe I had laying around.
Homemade electric hydro power pack. I put a love-joy connector between the motor and pump to take care of any minor misalignments. See the gauge? I don't think I've ever seen it go over 700 PSI, even bending heavy wall tubing this thing is just loafing along and not even trying hard.
The log splitter valve lets you feather the lever to creep very slowly for when you're sneaking up on a degree mark, or move at full speed. It will also auto retract the ram and stop itself when the ram is fully pulled back.
And while you're at it, you might as well add a little grinder rack to it and an outlet, which is always handy.
And lastly, I threw out that stupid pointer that came stock on this bender and I use this cheap $7 Harbor Fright laser pointer to indicate position on the degree wheel. I wish I could claim that I came up with that idea myself, but I didn't.