I\'ve just upgraded to a HDSP 9632 from an audiophile for the same reason (latency) Will be putting it into a new dedicated Giga computer(P4 3,2Ghz, 2GB corsair LL ram, raptor HD\'s, P4PC800-E mb) Will be a while before it is all together, but will let you know how good the hammerfall is when completed.
The Hammerfall is a very good card, because it uses very good DACs, and also has superior drivers in my opinion. The latest driver development also support GSIF 2.
The RME Hammerfall 9632, has had many positive reviews and the Hammerfall HDSP 9652/9632/Multiface/Digiface all have been working with real low latency. The Hammerfalls are also more forgiving with Motherboard chipset configurations, therefore not being as picky with regards to compatibility. I would highly recommend the RME line for stability, excellent sound quality and low latency.