Hello JohnLe,

I'm owning GW-7, it has great sounds (including many new wonderful ethic sounds). However, it doesn't have as many functions as PSR-3000 has.
In my opinion, as for sounds only, GW-7 is a good choice with resonable price.
Combining 2100 + GW-7 is the best solution (more than what PSR-3000 can do)

Good luck