Dan have you consider Adaptive Optics?
This maybe a cheaper alternative to use with your existing setup.
Check out this chaps blog and his gallery of work. Lx200gps 12" on wedge QHYccd with SX AO unit.
http://astroanarchy.blogspot.com.au/...00-gps-12.html
I have a G11 but if i had the money Mach1 would be my first choice.