I like the Lee Oskars (the harp player with War, as in Low Rider).
www.leeoskar.comTheir tone is brighter than a Hohner, they seem to respond faster.
If you want to learn blues harp, there are several good books, but I can't remember the titles now. Anyway, for blues harp, it is played what is known as "second position". The tonic chord is draw, not blow. (draw notes are easier to bend) So, to play blues in G, you buy a C harmonica. This puts the tonic chord as a draw G, then subdominiant chord is a blown C, and the dominant will be a drawn Dm... this gives you the blue or flattened 7th degree (F natural in this case) of the scale.
And G is a good blues key for guitar. For that you need a C harp.
Also, guitarists like E, for that you need a harp in A.
www.harmonicalessons.com You can find books here, too.