What is the rest of your system?
Frankly, the Focusrite is a pretty good A to D unit with a bunch of other facilities for monitoring, dynamics, etc. built in. Unless you have a perfect acoustic space, great monitors and great microphones, I doubt you'll even hear the difference in the converters.
If I had $2500 to spend, frankly I'd spend it on acoustics, monitors, microphones or pre amps, depending on where the weakest link in the system is.