truck size help.

Sorry if I've posted in the wrong section please move it if I have.
I've just bought an 8.5" board and I've been looking at Thunder trucks, but I'm unsure whether I'd need 149 or 151s, I like to be able to look down and see the axle nuts slightly protruding.
I've been considering Indys too, but I've read different things online, some people saying 159s are better suited on an 8.5" as it gives you more grinding surface.
Also, what other brands would be a good alternative to Thunder or Indys, are Theeve CSX V3s any good?
It will be used as an all round setup for both street and transition.
Any advice would be much appreciated, thanks in advance.
I've just bought an 8.5" board and I've been looking at Thunder trucks, but I'm unsure whether I'd need 149 or 151s, I like to be able to look down and see the axle nuts slightly protruding.
I've been considering Indys too, but I've read different things online, some people saying 159s are better suited on an 8.5" as it gives you more grinding surface.
Also, what other brands would be a good alternative to Thunder or Indys, are Theeve CSX V3s any good?
It will be used as an all round setup for both street and transition.
Any advice would be much appreciated, thanks in advance.