Thanks Minda and Loretta for the advice.
Well I'm now the proud owner of a Husqvarna Viking Sappire 870. I asked a few people about Mr Bernina and got such negative feedback that I decided to avoid him at all costs. I'm delighted with my new machine, I just have to get a walking foot for it now- the dealer thought I might not need one but I've a couple of puckers on a tree skirt I'm quilting so I'll just go and get one.
Thanks again,
Imelda