Jared! Good to see you on the forum!
I'm going to side with those that suggest taking the C++, given your options of C++, vb and FORTRAN. Being an old FORTRAN dinosaur, I wish I could say take it first. But, you will encounter more C-type structure and syntax now-a-days. Having said that, however, there are millions of lines of FORTRAN 77 out there in the engineering community that are not going anywhere. It has been verified and validated and no company wants to spend $$, just to re-verify and re-validate it in another language. You will still encounter it in engineering applications. Besides, the gnu GCC utilties allow you to write in FORTRAN, C, C++, ADA and mix and match them...well...almost.
Something else I'd like to point out is that since the 1980's, engineering companies have been using "pictures-to-code" software (think Easy-C) to remove the logic and analysis design process from a particular language syntax and structure. Getting familiar with Matlab/Simulink and/or LabView will take you a long way towards being ready for that. Having the knowledge of a language and syntax, will be invaluable to you, however, when you need to get into the nuts and bolts of debugging problems.
Now...if they'd only target FORTRAN 95 as the language of choice for the 2009 FRC
Eric