babiiguhurll:
I have the nanocube 6. It's a great cube, and I'm happy you have one. Feel free to hit me up whenever if you need further advice.
The first part of the setting up a 6er is just having patience, and getting all the necessary things first before anything else.
the upgraded pump is a great idea for the extra flow (2006 cube should give a nice pump that should do the trick)
With your LR, you can go with nice exotic pieces, (go small, as it's real easy to get too much)
LS, aragonite, a nice fine sand should do real nice.
Get a surface skimmer, that does wonders for keeping the top water from getting all "scummy"
Before I go with more, be sure to check out the other posts of other people's setups.....you'd be amazed by how much you could do with the 6er.