You can receive quite a bit on c-band on a 1.2m i have myself and pride21 has see his photos here
C-band on 1.2m offset andrew cm dish,
The best c-band lnbs i have used are the 13k panaroma 13/18v volt switching ones i brought a few from
Ebay
usa they are very cheap to buy the problem you have with using c-band on a offset dish is you need to make a lnb holder of find a dish with 60mm lnb holder also the scalar ring that comes with the dish is designed for a prime focus dish so you would need to make a scalar ring or find a suppler who sells offset scalar rings
Here is the c-band lnb-f that i use
Ebay
. 380027606461