I have the epson 720 and use white cds with great results. (using the "best photo" printing option) Never tried any other color blanks.
For inserts, I've tried different paper. Much of the photo paper was too heavy and would not crease well.
I've settled on HP brochure paper 180g/48 lb glossy (It isn't as glossy as photo paper). It allows double sided printing I do on some inserts/booklets.
I choose "Premium photo paper semi-gloss" in the printer's options.
If you do a 4-page booklet for the insert, it gets a little tight in the jewel case, but I don't do those anyway.
Just be careful not to get the "trifold" brochure or presentation paper; it has creases.
Hope this helps.
Dave