So I am going to be getting a new for reefing. I need a little input.

[kien]

Don't forget salt :-)

In my opinion bigger is not always better. I didn't quite catch it, why do you want a bigger tank? Are you finding that you are over stocking your 55 gallon? You say you have nitrate issues in your current tank? What is your nitrate removal procedure/method? A reef is a bit harder to maintain. Once you start adding corals you really have to watch your water chemistry.