ZincTrumpet
Thanks Peter. ST4 seems to be crammed with great new features.
The 30Gb sample set that comes with ST4 SE is almost as large as the ST3 full version (33Gb) so that a pretty good start.
The ST3 libraries will be available in the ST4 browser. The only difference between the ST4 versions should be the amount of new samples provided in SE, standard, and MAX.
So ST4 SE appears to be the most cost effective way to get the upgrade to new interface and features. I can see where the new browser and resizable GUI alone would be worth the price of admission for me.