It's so difficult to decide on hardware sometimes. I know for myself, I spend a lot of money on trying things that don't work out and they end up sitting on the shelf, waste of money. That's why I thought I would ask more questions from end users.
I see the TBS cards you're talking about on ebay. A very quick search on google leads me to many complaints, at least, when using it with mythtv for example, which usually means to me that a piece of hardware is too proprietary when it doesn't work to some degree right off the bat.
Of course, some hardware just takes more work and the results are better than average so again, the need for input

.
I have yet to grab one but am close to just 'grabbing' one to give it a try, go from there.
Next problem is I've noticed that c-band actuators aren't 13-18v, they are well over that which means a card won't be able to control a c-band dish, that sort of setup would need an external motor control.