Recently I took the plunge and got rid of my keyboard in favor of a midi controller and software synths which has made my living room a lot less cramped. I have been amazed at how many talented people out there are making amazing sounding soft synths at incredibly low prices. One of my favorite synths right now is ProtoPlasmTSM by H.G. Fortune. I recommend getting it bundled with the STS-24 and LaserBlade. The three synths feature a broad range of lush multi-layered sounds with a generous number of excellent presets. They have saved me from the musical doldrums this summer.