Snap-on is on the top, (but the price too)
Craftsman is very good
Facom/ beta cheaper than snap-on but not so efficient ( a lot of US aircraft are designed to be maintain with US tools)
I used also some Belzer tools in the past, very good, very compact, very well designed for aircraft mouse hole, but expensive as far i can remember.
In fact, the first question you have to fix is: how much cash do i have?