I'm gonna get slammed here, surely, but a decently priced M-Audio Keystation (61 or whatever) hooked into Reason will get everything you want and for less money than a Good stand alone synth. I imagine, anyway. I think my Keystation (semi weighted keys, no controls or drum pads... Just... Keys) was less than $250 and Reason will run about the same. I think. Don't quote me.
I don't own a stand alone synth, and I likely never will. I find myself getting into enough trouble with software.
But Reason is cool in that you can insert a synth, choose a sound, record, and then change your mind and change the sound OR the whole synth, and it's all automatically re-routed without a fuss or loss of track or copying and pasting one track to a new synth, blah blah blah...
Then, add effects to the track (of any sort from gating and sequencing and verb and whatEVER) and slice and dice the thing into oblivion. Hell, pile twelve effects on top of one another, then switch them around until you're happy. Allow Reason to auto route it all, or TAB to turn the module around and start manipulating the virtual patch cords to reroute it to your own specs. The interface is pictorially based on a rack system.
I find myself using Reason more and more and more these days, except for mixing. I slave Reason to sonar to mix or bounce tracks and import to Sonar for that. It's just easier for ME to do so. I know people who are perfectly happy to mix in Reason, though.
For electronica, I've had a MUCH easier time with Reason. That's it's forte. I've learned more in an infinitely shorter time frame as well. Its just intuitive and simple. If I were recording guitars and mic'ing drum kits.... Sonar. Absolutely.
I dunno if this helps any....