I will not suggest any one machine over another as sewing machines are such a personal choice. One thing I would say is to buy one with as large of harp space as possible within your budget. I love the machine I have but it only has a 6 12" harp space & is difficult to maneuver a larger than lap size quilt under the harp. Oh, and also, the needle up/down feature is a real delight to have.
You have a nice, healthy budget & should be able to find something you really like & meets your needs. I would suggest "test driving" as many different machines (models & brands) as possible & don't be in a rush or feel pressured from sales people to buy on the spot that day.
Happy hunting!