Advice on 5.1 surround setup for the decklink extreme 3d

Hi

I'm looking to get some powered 5.1 monitors for my edit/grading station and would love some advise on both speakers and connecting it up.

Here's my set up:

Mac pro running FCP7 and Da Vinci Resolve with Decklink Extreme 3d that drives a Panasonic grading monitor over SDI and panasonic plasma for clients over HDMI. The panny grade monitor also outputs SDI to win7 pc with a decklink Pro card to drive Vidscope scopes software.

I'm not looking for an amazing set-up as I won't be doing any 5.1 mixing just need to hear it.

Thanks
Michael