re: Best harp for beginner playing the Blues?

Marine band in the white box. Get one in A as it's probably the easiest to learn on. It's most common to play in 2nd position which is the classic blues sound (see Augie's post above). Once you figure the layout and isolating notes you may want to try 1st and third positions too. Tone-wise, stick that sucka way back in your mouth and not up front.