After owning an asc-1, id never use anything else, regardless of if i were using a polorotor (which i am) or an lnbf. That thing is a tank, but performs like a Ferrari.
If you just want to see whats up there, i wouldnt see any problem with using the feedhorn and lnb you have but you need to figure out if it is horizontal or vertical (hopefully its horizontal as most of the strong transponders are horizontal if i remeber correctly), and use a 12v car battery to move the motor (after you test, clean and lube it up). I dont know what you will and wont get with an 8' dish as the first one i put up was a 10' but there is plenty for sure up there to watch. After you get a taste of what there is then you can make a decision from there how much you want to spend, and could do it in phases. Read the bud guide from fat air, and browse these forums to learn learn learn. Like i said in a previous post, i thought c-band was going to be a cake walk but boy was i wrong.