Ideally, a level gate would be best for wpvp. Only +/-X levels of your level can wpvp with you. This keeps the fun aspect of wpvp, without the unbalanced ganks. I would think 5-10 level +/- would be ideal and fair.
 
	I enjoy balance. Dying to something you have no control over is really disheartening - dying to someone around your level is still enjoyable and something you actually have a chance to fight against.