another thought on framing is not to quilt it but to simply frame it as a textile. Quilted pieces require shadow box frames which are much more expensive than regular frames. I have framed my work both ways and really don't see a need for the shadow boxes--especially if you want to recoup your investment of time and money.
Your work is stunning, btw. I would think 300+ is a good price though don't know your market.
Laurie