24/48 is about as good as you'll get in reality. 24bit/96kHz sounds better in theory (on paper) but really is not a percieved improvement with anybody I have spoken with. Just doubles the file size.

24/44 is fine most times. There is a bigger improvement going from 16 bit to 24 bit than going from the 44kHz to 48kHz or even 96..
Has to do with the size of the chunks of the samples taken during recording.

The bit size determines how long each sample lasts (the size of the chunk over time) and the frequency is how often the samples occur. There is a math formula that says that the frequency cut in half is approximately the reproduced sample frequency range. In other words if you record at 44kHz you can reproduce 22 kHz frequencies (almost) and if you go to 48 kHz you can reproduce 24kHz (not much change there)...and going to 96 means we can theoretically produce up to 48kHz (great for songs you want to play for your dog).
But the bit rate or chunk size adds a lot of depth to the frequency range that IS being reproduced..
Better to use 24 bit with only 44 kHz than to try 16 bit with higher frequencies.
Sonicly speaking anyways..

I do not work here, but the benefits are still awesome
Make your sound your own!