I sharpen down at a local sporting goods place on the weekends, and the belt is all I've found a need for. I have an EP that I use a fair bit on my own stuff, and a WEPS that just shipped today that I'll be using for ceramics and fun. I guess it depends on precisely what you want to accomplish. With the Trizact abrasives and SurgiSharp leather, I can put on edges that can pass almost any realistic test you'd want to put a pocket knife to, and are nicely polished. I say 'realistic' because I haven't managed to get one to pass the hanging hair test yet, but they'll shave effortlessly, push-cut phonebook paper, smoothly sever twine, etc.
Honestly, if I had to pick only one sharpener to use? It'd be the belt. The versatility is just tremendous. Keep practicing! If you want to spend some cash to improve your equipment,look into a Kalamazoo SM1 belt grinder and the Trizact belts that Doug Rising offers. The Trizacts last a lot longer and leave a much more even, consistent finish than a grit belt does.