First off, I'd really, REALLY recommend dual-booting linux and windows. As much as I enjoy working in linux the audio support just isn't there yet. There is no real foorbar replacement in linux, although AmaroK, JuK, and Rhythmbox each come somewhat close in their own ways. Until the LAMIP project gets further along you'll just have to wait.
Now, as far as audio cards are concerned: I took the chance and got an Audiophile 192 (ice1724). It sounds absolutely wonderful, but it produces extremely wierd, garbled output in linux under Alsa. Haven't tried OSS yet. There's probably some way I can get it working in Alsa, but I really don't have the experience in linux to figure that out easily. So basically, I can tell you that the AP192 *should* work in linux... somehow. But I can't guarantee anything.
The safest cards you could get below that are the AP2496 (ice1712) and Echo MiaMidi, (the latter I'd assume to be the better card) but there's a significant difference in sound quality here. These two cards won't match up quality-wise to the 1212M, although I don't think it's quite as far off as most people on this board would lead you to believe (that's just because I didn't like the 0404).
I hope this information helps. Good luck to you.