All the engines you mention here can't came close to a Picco .28
For $200.00, a Picco 28 will turn arround an LRP 30 or Axial 32.
And if you make it mod by Clockwork Racing, AB Mods or Extrem RC Mods, you'll have a reliable, long lasting mental powerhouse at a realy good price.
I have a stock Mach 427 for now in my LST2, and i'am to buy a Moded Picco 28 for when the Mach will died.