Tried Vegas and it did not function the way I needed it to (i.e., 4 discreet tracks in real time using the FW 1814). Also, I wasn't looking for the video capabilities of Vegas. But for this ASIO situation, Wavelab works very well for my needs. I've had no problems recording 24/96 in two track.
There is an update to the ASIO drivers for Wavelab...but unfortunately you have to have the full version of Wavelab 5 with the CD in order to apply the patch (and I'm just running the demo right now). I'm checking with a couple different sources to determine if the patch works in this situation or not. Be a bummer to plunk down the $$ for Wavelab 5 to discover it won't work even with the patch.