Hello!
My name is Max, I am from Russia(UTC+7).
I'm newbie on Freelancer, but have 10+ year experience in C/C++ programming(not C#).
You need a fast viewer,so I think the native application written in C++ will suit you most.
I can use OpenGL and PCL(depend of input data format you have).
budget finally will depend on the required functionality of the program.
If it's not difficult, answer please a few clarifying questions:
1) in what format the input data is?
2) is it possible to use an open source frameworks?
3) is some GUI needed?
4) it will be a standalone utility or part of another program(if so, which stack of tech it use)?
Will be glad to work with you!
Kind regards.