I'd love to know which 'Mech choices were the second most popular after the Urbie.
I imagine the C* L2's were popular just for the 6th mech free.
Myself I went with 4 from each of the unit sizes w/ the 5th star from the boxed set & the Urbie being extras.
My own choices were all about getting mechs that I didn't own or that I owned very few of. (which was hard to find since I easily own a regiment of IS & cluster+ of clan mechs.)
Stuff like the Raven, BlackJack, Bushwacker, & Cataphract were high on my list for IS lances.
For the clan stars I picked up SuperNova, Mad-II, Piranha & several others that I don't own already.
The C*/SLDF level 2's were also great since I only own about 1/2 the 2750 TRO mechs. Adding King Crab, Mongoose, Lancelot, Sentinel, & Black Knight to my collection is nice.