A good, low cost, multi purpose expansion kit from Platinum Samples is the Rock Legends kit. It's not huge or anything but the sounds in it are very flexible for most rock and can be tweak out for other stuff. It's much better sounding than the content included in Eco. I'm not sure about the content in BFD2 but from the samples on the fxpansion site I'd say the Rock Legends kit beat those out too.
I got mine free with the $50 special last summer and I am SOOOO thankful it was included. Between that and the Zidjian pack I picked up I can do most everything I want.
Cheers.