Saw (and played) a rather nice sounding Gremlin Anglo over the weekend at the Hobgoblin stall at Fylde. Very good value for about £350 new and in Hobgoblins catalogue.Not sure if an anglo or english is more appropriate for sea songs and shanties but the guy on the advert that gets his concertina cut up and then starts playing a mouth organ plays an anglo while singing a shanty and it sound fine.
If you already play mouth organ btw I would suggest an anglo as it is basicaly the same (suck/blow) principle.
Cheers
D the G