best HP scientific calculator

[Marcio]

Well, I am going to use it for engineering stuff, nothing fancy though, things that would require a lot of keystrokes on the 50g, for example, I would like it to have or perform the following:

Stats on one and two variables;
Solver application;
Numerical integration;
Fit data to equations;
Solve polynomials;
Entry level programming (enter x, return y) etc;

Thanks.

Marcio