I would look at a Janome 6500 which is the forerunner of the 6600 and the Horizon. It is a real work horse, has needle up/down, thread cutter, lots of stitches and a 9 inch throat space. I have quilted twin size quilts and one that was half way between a double and queen without any issues. They are selling new for around $1100 but you can find them on ebay for less than $1000.
Good luck with your search but most of all, CONGRATULATIONS ON BECOMING A NURSE!