If you're dipping your toes in the concertina waters I'd save up a bit more and get a Jack - they're on sale from the Music Room in Cleckheaton for under 400GBP, and I really wouldn't look at anything Hobgoblin have got under that price mark.

Baritones are IMNSHO definately the way to go for singing, the combination is lovely.

I started on concertina with a Jackie (the treble equivalent) and although they are a bit, well, hmmmm, compared to a really nice concertina, they are brilliant for starting on, finding out if EC and you are going to get on, and whether you want to stick with the Jack or it's then worth spending the serious money on getting a really decent concertina.

Jack's, like Jackies, have certain mechanical issues with reeds and buttons, so have a look round the forums at concertina.net for tips on fixing them. Alternatively I'm in South Manchester, and would happily meet up one evening to pass on what I know about keeping Jackies running (it's all very simple and straightforward - it must be if I'm prepared to do it with my low level of mechanical expertise and confidence!)

So to sum up - my 0.02p, for what it's worth, is ignore those who will no doubt weigh in with suggestions of accordions or guitars or Peruvian chordal noseflutes or whatever, go with the idea of a baritone concertina, and consider a Jack.