The stunticons formed Menosaur and the Combaticons formed Bruticus. And ofcourse Constructions formed Devastor. Sorry have to keep the G1 facts straight.
I suggest check ebay. There are some nice combo deals with all of these reissues where you can find sometimes 3 for $50, much better deal. Also they offer the takara versions which are MUCH more limited, use more die-cast, and gain value at a much faster rate.
There is also a better Unicron only avail in Jap going on Ebay that is much nicer than the Armada junk. If you love G1 Trans, read the Dreamwave comics!!! The are incredible. Even Armada, now Energon is pretty good.