You think Chavez is only happy with ruling Venezuela? Was Hitler only happy with ruling Germany?
First Chavez has to consolidate total power in Venezuela, to make his socialist tyranny irreversible. That is the necessary step one, and he is far from there.
Sure, he'll meddle elsewhere (such as by providing arms to the FARC in Colombia) but I sure don't see any invasion of neighboring countries by the Venezuelan military, not for years if ever.