What about considering selling your XP-10 and purchasing an XP-30? A JV-1010 plus the Orchestral board (just mention it because it has great orchestral strings samples among its numerous terrific orchestral instrument patches) will cost over $600; XP-30, which has the Orchestral and Session (plus Techno) boards "built-in" costs about $300 more. Selling your XP-10 could cover that difference. With the 30, you'd get a far superior interface (compared to 1010), a keyboard with great action (I like it; seems a bit stiffer than the one XP10 I played), room for 2 more expansion boards, and portability of a great synth. Getting the 1010 gives you the ADDITIONAL polyphony, though, if you need it.
Just a thought...
As Arvon mentioned, there are non-Roland options. Why not go to a shop and listen to the strings sounds of the different makers of synths? It really does "come down to" liking what you hear. You mentioned that have a "low budget"...the Triton and K2x00 synths might be a bit pricey for you (though you get many more features with these), but Korg and Yamaha both make inexpensive modules similar to the JV1010 that are worth a listen...
[This message has been edited by Wilkes (edited 04-02-2000).]