it all depends on the arms you buy.
the +2 wide is 2" wider on each side, allows you to be more stable, and allows some more travel. the +1 moves the spindle 1" forward, this basiaclly allows you to get more traction as it technically moves the motor back in the wheelbase.
the +2 will give you the wider look. and i dont think i have seen arms that are +2 without being +1 forward. brake lines should still work, but they will be tight. switching to steel braided lines is cheap, and gives you a must better feel in the handle. you can run stock shocks, as long as the arms are made for stock location. basically you have standard, yfs conversion, and long travel.
long travel hasits own style of a arm, so you dont have to worry about that,
yfz isnt worth the time,
and standard is what most people run. you can run stock shocks, but a set of shocks made for you based off the a arms, your weight, and the type of riding you do will make a huge difference.