Future proofing a large UI Application - MFC with 2008 Feature pack, or C# and Winforms?

Question

My company has developed a long standing product using MFC in Visual C++ as the defacto standard for UI development. Our codebase contains ALOT of legacy/archaic code which

Answer 1

Thank you all kindly for your responses, it's reassuring to see that generally the consensus follows my line of thinking. I am in the fortunate situation that our software also runs on our own custom hardware (for the broadcast industry) - so the choice of OS is really ours and is thrust upon our customers. Currently we're running XP/2000, but I can see a desire to move up to Vista soon.

However, we also need to maintain very fine control over GPU performance, which I guess automatically rules out WPF and hardware acceleration? I should have made that point in my original post - sorry. Perhaps it's possible to use two GPUs... but that's another question altogether...

The team doesn't have any significant C# experience and I'm no expert myself, but I think the overall long term benefits of a managed environment probably outweigh the time it'll take to get up to speed.

Looks like Winforms and C# have it for now.