So if you're into software synths, then you need to take a look - and give a listen - to the rather amazing Zebra software synthesizer. Another example of a great software instrument engineered by one primary creator, Urs Heckmann, Zebra is a smooth-sounding software synth supreme, with extensive modulation options (almost as intricate as an actual analog patchcord synth) and an absolutely gorgeous sound. It's almost a desert-island software synth, and at $199, it's a steal. In fact, if you have an old hardware synth laying around, you can get $50 off the price of Zebra by sending in a picture of your old gear with a "Retired by Zebra" sign - it's called the "Dinosaur Crossgrade", and it's got to be the coolest upgrade policy in the industry.
I should also mention that their MFM2 (More Feedback Machine) effects plugin is probably the most insane echo/delay device that you can plug into a signal path. It's got 4 separate delay lines with extensive modulation options, and is capable of producing a staggering range of effects, including chorusing, compression, filter-combing, distortion, the list goes on and on. It's $79, and it makes most of my hardware delays sound downright stupid.
We love small developers, and Urs is really cranking out gold. Must be the German beer. If you want a taste of the genius of U-He, and you're a Mac musician, check out the free Audio Units synth from these guys, Rumblence:zoyd. A simple interface, but the sounds that emit from this thing are just juicy.