Very well explanation, I think kitkatcadbury there is no point to go with Ku band setup because no channels FTA on Ku better you should go with dd freedish if only Ku band and if want more channels FTA then go with c-band dishkitkatcadbury bro, with your existing setup, you can catch AS5 & ST2(D2h) on the same dish
You can't catch Insat 4A (83) Ku band as it is far from Insat 4B. Since most of the DTH operators have moved to MPEG4, request you to upgrade to MPEG4 STB
Let me know if you need any further information