Well, looks like we're back to square one again...
Did you buy your synths just for pianos and brass and all that meat & Potato stuff?

May be I'm overanalyzing (for which I apologize in advance), but it seems to me like you're buying your synths for their on-board samples. Not for the sonic ability or ANY programming capabilities for that matter. If you're after BIG piano sounds - get a sampler. Then you'll decide how to use up the memory. You know grab a CD ROM with 256 MG piano samples or whatever. Why not do that?
There's just NO point in complaining about on board ROM on your synth. You only solution is to spend a couple of grand and get your self a sampler.
BTW have you ever used a sampler, do you know what it is?