People keeping this one light have been seeing 22-24lbs. An 85 would keep this bird very light. I'm thinking no more than 23lbs. Unless you put smoke, nihms, and such. Do people still use nihms? Anyway, Mine is almost finished. I have a BME 102 on the business end, two A123 2300's 2cell from Max-Amps powering an AR9100 DSM2 receiver, and a Fromco 2 cell on the ignition. Also using three matchboxes for ailerons and elevator. I'll post the weight here when I'm done (probably this friday.)
There is a thread here:
http://www.rcuniverse.com/forum/m_71..._1/key_/tm.htm
All the info you could ever want about this plane is there. Some really good reading. Also, loose the main and tail gear immediately. The included mains are almost flat when I put my wings on. Everyone that has flown this plane and shared their experience said the plane flies great and straight. I myself would go with the 100cc. You can always toss this in a 35% later on. Some will say the 85 will also pull a 35%, but at 3000+' I wouldn't bother.
Steve