We have a variety of smooth papers that meet your thickness requirements. However, are you seeking specifically a watercolor 'hotpress' smooth paper that is heavily sized both internally and externally for heavy paint washes? Or are you simply searching for a 500g-800g paper that is smooth?
the best place to start is by using our Ultimate Paper Selector tool, which can be found here:
The thickness work well for a stand alone print which can be framed without a matte.
Please advise