What is your budget for the lift? What are your plans for how you are going to use your Tacoma (just for looks, high speed offroad running, rock crawling, forest roads...)?
If you want to maintain a decent ride and do not want to spend a ton of money to do the lift, I recommend a maximum of a two-inch lift. Once you go higher than two inches the limited down travel hurts the ride quality and can also hurt off road performance.