Opening a US based LLC as a foreign investor

[Yonatan Weic]

Hi Everyone  

(newbie questions alert!) 
I'm looking to start my way as an REI and one of the first steps that I'd like to get is to open a US based company (probably an LLC)
as the tax rates varies from state to state

A) which place would you suggest to register the company at? (and  why) 
B) any limitation of doing so as a foreign  investor that doesn't live in the US (but can fly our for the procedure if needed) 

Thanks 
Yonatan