Celestron control software options

Hi Again, well my project is coming along nicley but slowly.

anyway ive got to make a decision on which software to use
to control my celestron nexstar scope from my PC, and i was wondering
if anyone had any experiences or opinions on particular packages
starry night pro is a common one by the looks of things but its about
£100 (unless you know a cheaper place) and I didnt really want to spend
that much.

Thanks for any advice

Simon

Simon