I'd suggest anything by Lethal Hardcore, my favorite studio. They shoot it well, with excellent color, lighting and background settings, and have lots of two-guy-on-one-girl scenes, a favorite of mine. Avoid anything by Evil Angel (esp. Jules Jordan garbage - the man hasn't a clue about how to hold a camera); also avoid New Sensations, as they seem to think porn benefits from lots of big rooms and natural light. They're wrong.