For 16/44.1, what you want is a non AC-97 card that doesn't resample everything to 48KHz. All of the semi-pro cards (afaik) fit this category, and certain consumer cards as well.
As far as 16/44.1 in general, it's just another bit-depth and bitrate, and no card will "do it better" than another in an absolute sort of way. If what you want is a halfway decent DAC on the card, any of the semi-pro or professional cards should fit the bill (I second the recommendation for the M-Audio Audiophile 24/96). Note that many of these semi-pro cards have no internal analog connector for CD-ROM drives, no mic input, no built-in MIDI synthesizer, etc... nothing that could potentially degrade SQ, so you lose some features compared to other cards (and gain a few high-end features as well).
One option would be to get the M-Audio Audiophile USB, and leave your current (cheaper) card installed for game playing and noncritical uses and for the consumer-level features you don't get with the better ones. If this is for a laptop, the Audiophile USB might be an especially good option. Check out Newegg.com for some good prices.