Wow! I'm quite impressed that you painted that much gobos in that short an amount of time. They look great, even more so with the low amount of iron they got and the tin look of the little plate armours. It's not right to mourn the lack of conversions, I know, especially since most LotR models do not really support it that easily, but you didn't change anything with the Goblins except for a shield or two, right?
It's a shame really, that they lack heavy hitters except for trolls. They look great though. I like the gritty, brownish colour scheme.
I'd vote for the gray cave bases. Fits well with the gobos and the whole living in a hole-thing. Plus it would really shine if you'd some day decide to make some Moria props and such.

Any chance we'll see the other members of the fellowship besides Gimli? Got the Moriabox here myself and am not quite convinced how to paint them and stuff. :/