I want to learn accordion from scratch. I currently play piano and guitar.
I was looking for a piano accordion because I already play piano, but then I read a post or two that got me thinking I'd be better off with a button. Here's my thinking:
Learning a new keyboard: if I buy a piano accordion, I know the right hand layout, so I don't need to learn that. However, accordion is a whole new muscle memory, and I can't look at the keyboard as I often do on piano. So perhaps I'm better off starting from scratch with no hang-ups or habits brought across to the new instrument.
Keys: I play with people a lot. I play in 'jam' sessions where a song is not always in the same key depending on who is leading. I am reasonably good at switching keys on other instruments, but one thing that got my attention instantly is that if I learn a piece on a button I only need to shift that and not relearn fingering in a new key as I do on piano or guitar. If that's the case, that's a HUGE positive for me. Especially because I may learn a song in the original key then perform it in another (for singing or making it easier on a variably skilled group). On the same topic, I don't want to be limited to a few keys. That's a total deal breaker for me (except if I can learn on a limited instrument and easily transition to an unlimited instrument). I understand that some button accordions are limited, and need to know how I tell they are not.
Availability: I don't want to buy a new instrument. Mainly because most things aren't built as good now, and also because I'm just not into buying new things when second hand are just as good. If there is good reason to buy new, please let me know.
Having said that, I'm in Australia, and have seen countless piano accordions for sale but few button ones that look like they aren't single key.
I want advice seeing I know little about accordions, and may have things wrong or holes in my understanding. Considering the above points (and feel free to add anything in leaving out), what would you do?
Thanks