Are you lookinG for a machine that just does straight stitches? I have the Pfaff 12oo Grandquilter. A very similar machine is available from Juki, Brother, Janome, and Viking. These mechanical machines run up to 1600 stitches per minute and have a built-in scissors. On the Pfaff, there is a cover plate for the feed dogs - no dropping the dogs. Not sure how the others handle that. The bobbin is large and a side-feed design that is a bit hard to reach - but an insert guide can be bought. (I still need to get mine.)
For a regular computerized machine, there is a large-throat variety available in different price points from Janome, Babylock, Pfaff, Viking.......They all have features galore.