Get you a bong with a diffuser and one or two perculators. This will increase the surface of the smoke allowing the water to filter it better. The warmer the water the better it will filter the carcinogens. The colder the water the easier it will be to take big hit and more THC will pass through the water, but the smoke won't be filtered as effectively.

This guy here is on my wish list, but you could even get a roor if your willing to spend the money:WS Series Messias Illusion Ice 5mm - Double Tree Perc - Online Shop