the TUSL2-C (Tualatin model of CUSL2-C) will support Tualatin as well as older Coppermine processors. so getting it now will provide a basis for your future upgrades since all the current processors then will be Tualatins within a year or so.
TUSL2-C has a CMedia 8738 audio controller, which is a real hardware sound adapter, while the CUSL2-C has onboard AC97 audio controller which is low cost and low performace just-good-for-practical-purposes audio option. the hardware chip would contribute to overall performance of the system.
for more info checkout the <A HREF="http://www.asus.com.tw/products/Motherboard/tualatin/tusl2-c/index.html" target="_new">TUSL2-C</A> and <A HREF="http://www.asus.com.tw/products/Motherboard/Pentiumpro/Cusl2-c/index.html" target="_new">CUSL-2-C</A> pages.
girish
<font color=blue>die-hard fans don't have heat-sinks!</font color=blue>