Nice portrait lenses for D7000

Hello!

I'm looking for advices on good (but no expensive) portrait lenses for my d7000.

Budget can't go much beyond 400-500$.

It prefer Nikon, then Sigma. But if there's one from another brand that outperforms the nikon's and sigma's, please, mention it!

I think the standard focal lengths would be great, don't know for sure yet, but I'm trying to stick to the 85-135 range.

Thanks a lot!