In addition to budget, you also need to determine which features you need, want and might need or want. If you know you want the machine to do a blanket stitch for applique that will rule out all of the straight stitch only machines.
For an all around quilting & sewing machine that may or may not ever get put on a machine quilting frame, I think you're going to have to really watch craigslist, ebay and the sew-its-for-sale type yahoo groups to get anything less than $1,000 and if you want new--you're looking at almost $2,000. But that is for my dream machine. Your dreams could be considerably cheaper than mine--LOL!