Buy a solid old mechanical machine for perfect piecing (i use a Singer 66 i bought for $30) and a Handiquilter Sweet 16 for quilting ($5,000 -6,000). That assumes you only quilt. If you do garment sewing or embroidery you might want the other machines mentioned, but if you don't you are spending lots of money on bells and whistles you don't need.
Pam