Thank you all for your prompt help and suggestions !
I am considering the #2 method also, ( servos in the middle of the wing),
but Sean, i think the torque rods may not efficiently balance the aileron load during high speeds ... isnt it ? but the advantage is, that its quick fast and wont add much weight or drag.
By the way, should i consider any other modifications on this plane ? how about deefing up the landing gear parts ( i have a dry dirt ground, and expect a few rough landings too ).

Thanks a tonne for all yoru help
-Gaurav