I have the whole shebang. Buy it and cry once. Yes you are correct, for through dovetails in 9-20 degrees, you need the correct guide fingers (dovetail bit with straight guides, straight bit with angled guides). You could perform half-blind dovetails without the corresponding angled guide fingers, but who likes those. I haven't bought anything from Akeda in a long time, (since LOML bought me the complete kit to go with my basic jig), but you used to be able to buy individual components. Again, you'd spend more now, but the kit really is worth it in my opinion. Also, do consider 8MM shanks. It's a simple bushing in the router, but as with all jigs, with the bit hanging out that far, every bit of extra steel helps. I have the 1/4" bits and haven't had an issue, but I can only imagine how much better 8MM would be.
The Akeda website doesn't seem to have everything, check
www.thejigstore.com.
Ryan