Since you already sew/quilt, I am sure that you could easily list the features you wish you had. Why not start there. Make a list of all the MUST HAVES and add the WOULD BE NICE TO HAVES.
For me it has always been about needle position, low bobbin indicator, built-in walking foot, and a nice blanket stitch. I own 3 Pfaffs, so you can tell where I landed. There are some things I am not impressed with on mine and that is the relatively poor lighting. I added an Ott-lite and the problem got solved.
You can check your list of features against the different brands and eliminate some right off. Then I would go to a dealer and start test driving.