If you search "soundblaster" you will get pages and pages of hits, almost all of them along the lines of "get rid of that &$*%&^ soundblaster!" No offense, it's just a well-known crappy sound card. You **MUST** have a capable, full-duplex card to use AA 2.0 (or any competent software), and failure to recognize that will lead to frustration.
Getting a great recorded sound ain't easy, or cheap. It's a fact of life. There are places you can cut corners; there are lots of instances of a person using creative micing techniques to get a great sound out of low-end gear, but the sound card is not the place to experiment. If the sound card is the limiting factor of your recording, think about it: EVERY SOUND that goes into, or comes out of, the computer, is compromised.
A mic, or a guitar, or a synth are all creative devices, and you will be able to express yourself despite limitations in design, interface or you-name-it: but a sound card is like the tires on your car: are you going to enter the Daytona 500 with Pep Boys recaps?