How good of a deal?
The Dufour is a great boat! The 44 is more traditional and more of a racer. The 45 is more "European" with a lot of class. I have been on both.
The Catalina is a very mid-range boat... Believe me, I have owned two and have experience off-shore on them. They are stable, won't surprise you, but a very mediocre boat compared to a Dufour.
The Dufour moves along really well with very little effort in all kinds of sea conditions. That is what they are known for.
Please advise further regarding the available "deal".