Just a quick note. How you present your work is important. You can compose something great, but if you use bad samples, your presentation will stink. The solution. Go through your samples and choose which sound best- expressive, real, etc. For example, I have an old 'rompler', an Alesis Quadrasynth Plus Piano. It came with about 500 patches. Out of all of those samples, I like about only a dozen or two. I compose music with those particular samples in mind. I really recommend writing for your best samples available, even if that means writing for only a dozen patches/samples. This will really help the presentation of your work. And, of course, if you can afford to acquire great (expensive) sample libraries, do it!