Hi Vinay,
I have a large Balcony facing direct North and Window facing South. Will this direction help? - Yes the window facing South will help. You can track satellites Insat 4CR (EduSat), AsiaSat 3S, ABS1 and Insat4B easily with little adjustments. Installing dish in window/balcony needs no permission as per my building committee. Check the rules once before starting.
Secondly, do I need to go for full HD (Solid 3000) or the one you mentioned is good enough? SOLID HDS2 3000 is better than 2100 if readily available. Beware of duplicates. Check at Sanjay Electronics, Grant Road(East)
Also, I forgot to ask for recording feature, can we get a DVR inbuilt / any other way? Yes original SOLID HD boxes have a USB slot to record on an external USB drive.