If you were only planning to run the current system until early in 2007 then you would want a newer model to go into the next case you build. The SB X-FI sound card by Creative seems popular now.
The Audigy 4 Pro 5.1 model card has worked out well here since it was saved from the old case that quit. The next model up from that is the 7.1 surround model seen at
http://www.newegg.com/Product/Produc...82E16829102004
If you want a card that will work good in a new build you will spend more now like the price difference seen with the model there or wait until an even better model drops in price. You have to decide the quality of the sound you want as well as what is in your budget. If you are saving now for a new build you could wait until other models drop in price. If you are as stubborn as this source here you will want to get some good model within your current budget.