hi adam,
welcome!
so you were after an ED APO then changed your mind to a 10" reflector? 'Aperture fever' kicked in fast! The mount is one of the most important factors to allow accurate tracking and holding all that weight. Generally people buy a ED 80 or an 8" reflector when starting out.
If you are going over an 8" reflector you will need a NEQ6 at a minimum
http://www.bintel.com.au/Mounts---Tr...oductview.aspx 8" and down you'd be looking at a HEQ5
http://www.bintel.com.au/Mounts---Tr...oductview.aspx
These come up second hand fairly frequently in the IIS classifieds
http://www.iceinspace.com.au/forum/forumdisplay.php?f=9 so keep an eye out.
For astrophotography you'll also need a guide camera with either a Off axis guider or a guide scope - to help your mount stay on target (this allows longer exposures) eg
http://www.bintel.com.au/Astrophotog...oductview.aspx
You may also need a field corrector like a coma corrector or field flattener depending on your scope (the one linked would need a coma corrector).
feel free to ask more questions, astrophotography is definitely jumping into the deep end!
Russ