The JV-1010 has all the patches from the XP-30/60/80 and JV2080/1080. In addition it has the "Session" expansion-board included.
The included Session-board should give you the pianos and strings you need. Especially the pianos on this board are considered to be among Roland's best. (Better than the dedicated piano-expansion) There is an audio demo of the session-board on rolandus.com
Lists of the patches are available both at Roland US and other pages. Check the patch-listings for XP-80 or JV2080, and for the Session-expansion. I don't think there exists a dedicated patch-list for the JV1010
Check out the pages below. One is the Roland support-documents page, and the other is the page of Geir Kilsti. Both contain patch- and waveform-listings for the XP's, JV's and the expansion boards.
http://home.sol.no/~gkilsti/sjv_list.html
http://www.rolandus.com/SUPPORT/DOCS/PATCH.HTM Stig