I think the Soundblaster cards probably will be inferior to the more expensive cards. They miss multiple inputs/outputs for one thing (although you can use the digital in/outs at the same time as the analogs).
You only need the KX drivers if you want to use the machine for recording with cubase or some similar program, but the drivers also work fine with games and other programs.
The learning curve to use the drivers is quite steep, but by reading the documentation on their site and tweaking a bit most people should be able to set it up.
The KX drivers also have several effects and instrument plugins and you have a very advanced routing interface directly to the soundcard.
If you're a musician on a tight budget (aren't we all :-) ) I strongly advice you to check this out and spend the money you save on f.ex a better microfone (or food).