I just need to say +1 for Xpand 2.
While there are better VSTis out there, I don't think you can do much better for the price, even at 49 bucks. Let alone the absolutely crazy deal at $1.
This would be indeed one of the best buys.
As a freeware, I'd recommend Independence Free from Magix, but IT IS a headache to install.
This for rompler type.
Synth type - simply too many to even start to mention.
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Yamaha S770, Studio One 3, EMU 0404USB, ESI, ATH, Dell. And others.