I have a Baby Lock Crown Jewel and have had absolutely no problem with it. For a beginner, the stitch regulator is important, but you may find after awhile that you can do without it. I think the other thing for a sit down machine would be the largest table you can fit in your sewing area - the machine needs to sit with the plate flat at table top level. The Tiara may come with a table. My Crown Jewel came with several LED lights and spaces to add more. You might want to order more with it if there are extra spaces.
Hope you enjoy it!