I'm discovering the UAD-2 plugins. Waaaww. Amazing sound. A bit expensive, though. Still, with DSP technology like this, I think there is very little need for the real hardware alternatives - those are even more expensive.
Here are the analog classics that came bundled with the hardware (together with a 500$ voucher - I still need to decide an what other plugins to buy with it):
Francis Depuydt, owner of Roth Eleven Productions.