If you have your heart set on a Nexstar I'd say to go with the ARF version
http://www3.towerhobbies.com/cgi-bin...&I=LXJDH3&P=ML and install the radio and engine of your choice.
Plane = $110
46AX eng = $130
http://www3.towerhobbies.com/cgi-bin...VSEARCH=lxfmd5
Futaba 6 ch 2.4 radio $220
http://www3.towerhobbies.com/cgi-bin...VSEARCH=lxpzt8