av7=american model. av10=european model. the main difference is that the av7 is regular old piston port, while the av10 is case inducted w/ reed valves.
right now you could build a crazy fuck av10 with the shit at treatsHQ alone. gotta have deep pockets though (not that his prices arent good). if you were to build an av10 from scratch solely using the stuff from his shop... youre looking at roughly $1000 to get started.