Mockie... don't forget, there is an SRX Strings board that can go into your G70. I have the -06 Orchestral board, and it's quite good. The -04 strings one sounds great too.
Obviously, not as detailed and extensive as some of the VSTi's, but you ought to be able to pick one up for a couple of hundred bucks.
Listen to the demos here:
http://www.rolandus.com/flash/demos/srx/srx_demo.htmlDrag the SRX-04 board onto the keyboards slots...