My Blizzard has held up well so far. I'm running a LMT XL2800 on 2s with a Sidewinder. I can't remember the gearing... I do remember doing some passes with the same motor on
4s with the MMM (yes it wheelied) and nothing broke. It was uncontrollable, but nothing broke... Realisticly, any system capable of 300-500W will push it along just fine since they weigh very little. The tracks don't have as much friction as you would think as long as the tension is set correctly.
[edit] I just noticed the word "as" appears in the last sentence 4 times..... Carry on.