and blind does NOT throw in a subtle reference to his website.
the 300 sized motors are probably the most popular. variations include the graupner speed 300, wattage 370, team orion big block. all the same motor at different prices and labels. other popular alternatives:
corless motors: includes team orion elite mod, and peak turbo corless. more power than stock but slower than 300. however, very long runtimes.