While this auction will end before you see it, something like this might be a good solution for you.
http://cgi.ebay.com/Yamaha-Keyboard-PSR-...=item3a560b378aFind a newer used keyboard that has better sounds on it, because you might be able to use the built in sounds over what sounds you'll get out of BIAB and the Roland VSC, or whatever else you may be using.
Other examples:
http://cgi.ebay.com/Yamaha-PSR-E223-61-K...=item35a5c71af8http://cgi.ebay.com/Nice-YAMAHA-electron...=item53decbc75chttp://cgi.ebay.com/Barely-used-Yamaha-P...=item2c525b41abIf you can find a way to afford this, you'll be really pleased.
http://cgi.ebay.com/Yamaha-PSR-S500-61-K...=item439c427a08Finally, you can download the manuals for any of those keyboards here:
http://www.yamaha.co.jp/manual/english/index.phpThat will give you an indication of whether or not they will work for you.
You might also look at Korg:
http://cgi.ebay.com/Korg-N264-76-Key-Key...=item3efb6a69c2This uses the AI2 synthesis method, but still sounds good.
The X5 will do nicely for you, too, and is smaller.
http://cgi.ebay.com/Korg-X-5-X5-61-Key-S...=item35a5e03e18This is the reason I own Korg arrangers. The i3 started it all for me, and was leaps and bounds above everything else out there at the time. It still is a seriously cool piece of gear.
http://cgi.ebay.com/Korg-I3-I-3-Vintage-...=item53debba456Or, you can also look at some of the Roland, Casio and other keyboards.
Lots of capability out there for less than $200, if you don't mind used.
Gary