Although the HEQ5 is alright, ide really be pushing you to a EQ6. If its brand new that you want to purchase then youll be paying that kind of money but eq6's come up from time to time
here is a guy selling the complete package, which includes virtually everything you need to kick off imaging bar the mount. Now if you are crafty, you can buy the whole lot sell off the other parts you don't want/need recoup your dollars and get the mount with the funds raised.
Both of those scopes hold their value as they are quite good! My ED 80 sold for 550 last month to give you a idea and the 120 is a whole lot bigger!
If you use your noodle

you can get a good deal with good gear and not have to fork out the world!
Brendan