One vote for the 3W 106 !! Lots of torque,turning a 3W 28x10 prop straight out of the box at almost 6100. Hands on with both the BME extreme 102 and 3W 106 with same props NX 27x10 and johnson mufflers the Bme shakes considerably/visibly more than the 3W. Both motors run good but the 3W is breaking in with a NX 27x10 (actually not quite enough prop,should be running a 3W 27x10) while the BME 102 fully broken in!! runs best with a Mejzlik 26x10. The 3W has noticably/visually more power and is able to turn and unwind the larger prop with authority and at a little faster pace than the BME 102 with the same size prop.
using same prop same cans the BME doesn't stack up next to the 106 power wise, by repropping and using tuned cans(EXPENSIVE) the BME might be able to spin a larger prop but with stock setups like 90% of us guys use the motors are like night and day.
The ignition problems/weight problems 3W experienced in the past have been eliminated, I have personally had 7 3W's and every one has run like a champ, No ignition problems or air leaks to speak of, I will admit the 3W is a little harder to initially set up but once they are set they are good to go. I have a 3W 70 that I haven't touched the needles on in over 2 years going on 3 and the motor is getting stronger every year it runs.
The best way to get info on these 3 differen't engines is to go through this very site--RC Universe -- write down pros and cons of each because they ALL have them, look at 3W's old and new! there are a few that have had problems, very few compared to the guys who have had good luck with them especially the new light weights (3W 106)
There is enough info here to choke a cow so take your time and remember " in the long run your the only one you have to convince"