Yes, C1 would be the module, but then there is the fighters module, PF module, battleships, dreds, new cruisers, etc, etc. It's a good game but the number of expansions makes me hesitant to even take the first step.
If they released some sort of collector's edition with that 1980's box, I am not sure I could resist, but as it is the cost to benefit ratio at this point is not optimal, considering I'd be looking at a hefty sum to get current with what SFC offers.