I loved the T4 bossa/Latin styles and would have snagged one if they weren't so high priced.
I could make the basic styles from the 910 work just fine too...and would have done that except a friend lent me his Korg microarranger and those worked fine. (they're busier than Yamaha but well programmed, imho). if Yamaha offered a similar product I'd buy immediately.
re the Voice/Style expansion Yamaha has for the 650 and A2000, they did offer a Brazil pack initially. apparently it was only compatible w/ the 650 and not the A2000. it was not listed when I went back to the site the other day. why, Yamaha?