Sue,get one you can handle... it's all very well getting the sort that has all the special buttons and effects but if you can't lift it without a degree in weight liting it's not good for you....
I play smaller ones so as I can see over the top of them!!
one of mine is a kids Hohner, which is great if I am standing up playing on stage for any length of time. I have a bigger Scandalli which has a great sound.. but is heavier, much better for sitting down playing.... have fun
slainte
alison