if you wanna cut your own, the chimera should be faster in a straight line than any of those you mentioned. don't do a twin if you wanna go fast. bifurcated ducts decrease thrust, so not very conducive to speed. of those mentioned, the Bandit would be a good choice. or how about the Super Habu32 Humberto on this forum. looks promising and as all his designs are.............very easy to make.