Field mixer bang 4 the buck?

I am putting together some equipment for a a RED documentary. We will be using a RODE NTG-2 on a boom. While I don't think we will be using more than this mic for now, with the RED's audio level adjustment controls within the menus of the camera, I need to buy a field mixer. I have no idea where to start as I am not am not the audio guy. It's hard to say what the budget is...I want to get good a field mixer (w/ a bag) for under $1000? Actually I would prefer to do it under $500, but let me know if I'm pushing it. Is there one in that price range that blows away all of the competition? That would make things easier for me.

I guess what I am am looking for is the cheapest mixer for one RODE NTG-2 that won't be of less quality than the mic. Thanks for any tips!

-Logan