RME Fireface vs M-Audio Fast Track Ultra

Hey everyone!
In past I have been using the Echo Audiofire8 but have recently found that it actually had the same round trip latency as the U46DJMKII which is about 9ms which is fine but could be better. After researching for quite a bit, I nailed my choices down to two of these cards.
RME Fireface 400
M-Audio Fast Track Ultra
From what I read they are both pretty reliable and work pretty darn well (yes apparently the Ultra doesn't suck). I was set on getting the Fireface but the guy I was talking to at Saved by Tech brought up a interesting point. A lot of gear nowadays sound good and the price difference between the FTU and FF is pretty big ($1000).
While the Fireface does have better converters and RME is very rigorous with their driver support, I learned that both the Fireface and the FTU have relatively the same round trip latency @ which is 6ms which is very good. Near PCI interface like speeds. The Fireface on 48 buffers though is 4ms which is even better. My question is though, would it be worth that $1000 difference if I am just using for DVS use? I mean I love good quality gear but practically speaking, the FTU will do the trick as well.
What do you guys think?
In past I have been using the Echo Audiofire8 but have recently found that it actually had the same round trip latency as the U46DJMKII which is about 9ms which is fine but could be better. After researching for quite a bit, I nailed my choices down to two of these cards.
RME Fireface 400
M-Audio Fast Track Ultra
From what I read they are both pretty reliable and work pretty darn well (yes apparently the Ultra doesn't suck). I was set on getting the Fireface but the guy I was talking to at Saved by Tech brought up a interesting point. A lot of gear nowadays sound good and the price difference between the FTU and FF is pretty big ($1000).
While the Fireface does have better converters and RME is very rigorous with their driver support, I learned that both the Fireface and the FTU have relatively the same round trip latency @ which is 6ms which is very good. Near PCI interface like speeds. The Fireface on 48 buffers though is 4ms which is even better. My question is though, would it be worth that $1000 difference if I am just using for DVS use? I mean I love good quality gear but practically speaking, the FTU will do the trick as well.
What do you guys think?