Hi Chris, you could buy a QHY5L-ii ($370 incl post at gamma electronics or ~$250 ex. post from
http://www.tan14.com/gears.htm) and put it in your setup.
Run with it for a couple of weeks and see if it does the trick.
You can easily sell it for ~$50 less than the new price and get one of the others.
cheers,
Bram
PS. I have no financial links to either company