the OS 46 AX is really a great little engine for the price http://www3.towerhobbies.com/cgi-bin...?&I=LXFMD5&P=0
magnum not really that much cheaper than the OS http://www3.towerhobbies.com/cgi-bin...?&I=LXBUX6&P=0
again TT Pro 20$ http://www3.towerhobbies.com/cgi-bin...?&I=LXKF97&P=0
there all close in priceOS is also giving a small rebate and I do mean small but the cost Vs. product your getting a easy to run( tune,break in,and reliable running qualitys)for the small extra your going to pay,I am a bit biased since I am a OS fan but the product speaks for its self.