Re: How good will a new sound card be, what to get?
I agree on the Audiophile. I have a very similar Echo MIA and it's a great 24.96 card.
Creative cards will do fine for electric guitar, which is a pretty low-fi instrument to begin with. But they aren't the greatest. Maybe this new one is, but since they've claimed that for every card since the Live! and hid behind questionable specs and crappy drivers, I'm skeptical.
If you want to build your rig up to a real pro or semi pro recording level and have the flexibility to record many things at high quality, I'd avoid Creative. Of course, if you want a decent card that also does great with PC games, Creative may be just the thing.