Besides a simple machine with a longer throat...I'd also like to have more height like the old Singers have. I own a Viking Sapphire 875, love it. However changing the needle is difficult as there's not much room to get my hands in that space. I prefer the vertical bobbin system rather than a drop in type bobbin, I feel it gives a better stitch for FMQ. Just a straight stitch machine that has feed dogs that can be dropped, for either walking foot grid quilting or FMQ.
Sharon