tpharker,
What have you been doing with your Nexstar?? Can you fly it inverted?? Start performing basic aerobatic maneuvers with it (loop, roll, split-s, immelman, stall turn, inverted flight, outside loop, 4 point roll, slow roll). When you're bored with those then it's time to move up. I'm not trying to put you down in any way, but instead trying to help prepare you for a second plane. I see this with students a lot of times. They will solo and then fly for a few weeks and say they are bored, but they have never explored all that they can with their trainer. When they move up to a second plane they find that they're really not ready for it. I assure you that if you can do all of those maneuvers on your Nexstar then you will be ready for just about any second plane you would want.

A lot of people say they are bored with their trainers, but they are fun planes to fly. I still have my trainer that I learned on 10 years ago, and I still fly it. It's fun to go out with your trainer every now and then and fly maneuvers with it.

Now on the other hand, if you can do all of that on your Nexstar it may very well be time to move up to a more capable second plane. Here are some suggestions for a second plane that will give you more capabilities:

Sig 4-star 60 - [link=http://www2.towerhobbies.com/cgi-bin/wti0001p?&I=LXCHY3&P=0]Sig 4-star 60[/link]
Goldberg Tiger 60 - [link=http://www2.towerhobbies.com/cgi-bin/wti0001p?&I=LXH756&P=0]the Tiger 60 [/link]
BTE Venture 60 - [link=http://www.btemodels.com/venture.html]Venture 60 [/link]
Great Planes Easy Sport 40 - [link=http://www2.towerhobbies.com/cgi-bin/wti0001p?&I=LXDTM8&P=ML]Great Planes Easy Sport [/link]
Great Planes Super Sportster - [link=http://www2.towerhobbies.com/cgi-bin/wti0001p?&I=LXAVR1&P=ML]Great Planes Super Sportster [/link]
More information is available here: [link]http://www.geistware.com/rcmodeling/second_plane.htm[/link]

Hope this helps

Ken