QUOTE (Dirge @ Nov 7 2008, 12:13 AM)

Anglo and English are quite different instruments; sound the same, but key layouts are completely different. Good players can do anything they like with them but normal mortals find the 2 types are suited to different music styles ; that's something else you can research as well if you hadn't realised this is a choice you need to make at the outset.
Great instrument the concertina. You'll love it, I promise.
Absolutely!
When I started out on a 20-button Anglo, in the pre-Internet era, I was unaware that there were different kinds of concertina. So I just became an Angloist. The Anglo suited what I wanted to do - accompany singing and play harmonised melodies. Had I happened upon an English concertina, no doublt I would have developed more classically.
If it is the Anglo you decide for, 20 buttons are enough for a start. When you've got the feeling for them, you can upgrade to a 30- or more-button Anglo, or even a Bandoneon! (Been there, done that!

) These 20 buttons are at the centre of all diatonic concertina-type instruments. Bigger instruments just have additional buttons for more capabilities.
As to the financial side: Even a cheap 20-button, pearloid Anglo is going to cost money - not much, but nevertheless.
Two things can happen: you find you don't like it after all, and your moderate investment is lost. Resale value for these concertinas is low.
Or you like it, and take to it, and would like to have a quality sound come out when you play it. You will not get this from a cheap 'box. So you'll have to upgrade, i.e. lose the investment on the starter 'box AND pay for a "proper" one.
Either way, the cheap concertina is a write-off.
Good vintage concertinas, on the other hand, keep their value, or even increase in value. There are really good, old 20-button concertinas going on Ebay all the time. These are more expensive than a new Rochelle, but the sound and playability will be far superior. The chances of your falling in love with such an instrument are much higher, and you can make really good music on them when you've got the hang of it.
And whether you later want to upgrade to 30 buttons, or (unlikely) think it's a waste of time - you can probably recoup your expenses by re-selling.
You haven't got enough pocket money? Then regard the vintage Anglo as an investment - take the money from your savings account, not from your current account!

One way or the other, you can pay it back later, probably with interest.
One aspect of the Rochelle as an entry model is that you can trade it in when buying a better model. But you're tied to that maker, or to makes that the dealer carries! And this advantage is further offset by uncomfortable handling and a mediochre sound (I've tried one).
If I had to begin again, I'd go for a restored, vintage Lachenal 20-button Anglo, rather than the cheap East German one that I had!
Hope this helps,
Cheers,
John