I use my LCD2 Rev.2 with Graham Slee Voyager. It sounds great... very neutral sound. But LCD2 sounds so much better with my Graham Slee Solo UL. However, it's not in the portable amp category. I might try RSA SR-71A or SR-71B in the future.

@lozanoa11: How's your SR-325 now? Happy ending?

I prefer the bass from Beyer, but you really need a good amp. You should avoid AKG K701 or K702. If you need plenty of bass, then I recommend Bose around-ear or on-ear. The bass is super strong though, even without an amp.