you do not need a special machine to machine quilt a quilt- you only need practice
many many fabulous- famous - spectacular international award winning quilters quilt on a domestic machine (the same machine they piece with)
there are tons of tutorials, videos and classes available to help you learn to free motion quilt with your domestic machine.
the first quilt i ever quilted was an $89 brother i bought at walmart- took a class at the lqs and did quite well.
it does not take anything special- just the desire and lots of practice.