That depends on the hardware you are willing to use for recording, I doubt a laptop would come with 24bit recording but I don't do laptops so I wouldn't know!
Creative do loads of versions of the Audigy2 range now. There's an external USB version and I've even seen a PC card version just for laptops. You will have to look at some reviews to find out how reliable these are though.
Here's a link for the PC card version.
Oh yea I forgot to metion, Creative customer support are pretty dismal. I sent them an e-mail 3 days ago and haven't heard nothing yet. This is compared to Netgear who replied the next day!