Flow in my nano

[karazy]

So while I still have the option of how I'm going to be drilling my 29 gallon, i thought i'd ask some questions:

now i already know I'm going with a herbie overflow, but i can't decide what to do for the return.

here's a few options i've been thinking of. please comment on which you think would work best

P.S. the black thing with holes in it is the overflow box, and the red is a powerhead

p.s.s. the differences in the overflow boxes mean nothing, i just suck at paint

overflow1:

overflow2:

overflow3:

overflow4:

overflow5: