Tony,

If you run matchboxes in each wing, you will free up two channels which will allow for the choke servo and possibly for smoke down the road if you decide on that option.

If you go with the matchboxes, I have found donald's hobby to be the cheapest. You can get a two pack for around $90 or lurk on RCUniverse's marketplace and pickup a set for even cheaper.

The other option is to simply not use a choke servo. Eliminates the extra weight, and keeps it simple.