looking for a USB audio output thingy (xposted to ILM)

so, my radio station has an old Emac for an on-air playback source. the 1/8th headphone jack has been acting up and i want to run the audio through a USB port rather than fixing the jack (way hard) or getting a new computer.

criteria:
-sounds at least as good as the old headphone jack
-doesn't have any issues with the computer sleeping/hibernating. i don't want to have to reset something everytime the computer wakes up.
-compatible with a powerpc mac
-preferably it has a flat surface about 2" x 1" for me to glue a technalock onto

i don't care about the audio input quality. this computer isn't used for that. should i just get a griffin imic?

thanks for any advice you can give!

http://pro-audio.musiciansfriend.com/product/Behringer-UCONTROL-UCA202-USBAudio-Interface?sku=702540