Beyond Thai is on W. 3rd St., off 6th Ave--not so bad, nothing out of the ordinary but "decent and affordable. " Galangal is on W. 4th off 6th Ave--not very roomy but inexpensive.
There's also Kin Shop on 6th Ave and 11th Street...a little more expensive.
149 W 4th St, New York, NY 10012
Beyond Thai Kitchen
133 W 3rd St, New York, NY 10012
469 6th Ave, New York, NY 10011