I'd suggest just trying OU for now, I also have a pretty decent NU team =P (My team took forever to construct but it was very much a reconstruction of a team I liked on smogon)
For OU, are you looking for a balenced team, Stall Team, or more offensive team?
You could try to encorperate tactics like Trick Room, Rain Dance, Hail, Sunny Day (Most likely for NU), etc... Or center it around a pokemon...
I could help you contruct a decent team =)