I went to the local sewing machine dealer today and have totally fallen in love! Not with the salesman (although he was a very helpful chap) but with a lovely lovely sewing machine. It's the Juki Exceed Quilt and Pro and it is glorious!
It has everything I want in a machine plus some things I didn't know I want (until now!). The things I was looking for when I entered the shop were: a large throat space, needle up/down, speed limiter. I didn't realise that I wanted a knee lifter (super awesome attachment that when nudged by your knee will raise the presser foot), an automatic needle threader (I have one one the current machine - a Singer Talent 3321 - but never use it because it's awkward and to be honest takes longer for me than if I were to just thread it myself! The one on this machine is fabulous though!), the ability to cut the threads with a heel press on the foot pedal, automatic tension (he went from normal cotton thread, to a metallic thread, to an invisible thread and back to normal without changing the tension and each stitch was beautiful!), a big red light that tells you not to start sewing because the presser foot is raised (!!!) and a screen that shows you which presser foot you need for the stitch you have chosen.
It was truly a beautiful machine and had I had the money available I'm pretty sure I would have walked out with it! At least I now have a goal for me to save up for, as I was so unsure of what I wanted when I was just looking online as you can't really get a feel for the machine. Having seen it in action I am now certain that it is what I am looking for!