SMC are pretty good, so are Turnigy. Gens Ace are OK IMO, but I haven't had many of their packs.

I'd go with SMC over Turnigy, and the only reason is because SMC has better quality plastics, the turnigy pack cases are fragile.

These are great too, 30c may seem not punchy enough, but they feel more than 30c IMO. http://www.amainhobbies.com/product_...-ROAR-Approved