A good third language?

Okay, my main two languages are Ruby and C++. Although I've learned Ada out of school and I'm learning Scheme in school now, I don't consider them languages I'm generally GOOD with. So I'm wondering what third language I could learn to balance myself out.

>>31

Templates > Void pointers and preprocessor macros
Classes > Structs without inheritance or encapsulation... or methods for that matter.
Namespaces > Name prefixing like a bitch

Give me 3 good reasons to use pure C rather than the features offered through C++.