I'm with Pendragon on this.
If you were going to spend the money on a new Prodelin or ChannelMaster 1.8m
offset, that'd be expensive.
A 1.8m Fortec prime focus would probably be lighter, and wouldn't need the down-look wedge to adapt it to an AJAK H-H motor.
Then, there is the matter of feeds matching the dish, as he pointed out.
As for the size, do you have room for an 8' BUD?
edit:
There is the possibility that the Ku part of a Ck-1 or DMX741 would better match an offset dish.
However, that's an opinion/theory, and I don't believe anyone has shown it to be fact.
Then of course, a conical scalar, would take care of matching the C-band to an offset dish.