a 15g is a great place to start. It's very efficient under 1 bar, and spools fast. The faster your turbo spools, the better low end torque you'll produce, and the sooner your car will begin to accelerate. If you go too big on the turbine, it will be a PITA to spool, and once you do, it will take careful pedal pressure to maintain traction. If you're looking for something new, a Garrett T-28 is a good move. DSMers get 400hp out of it on a 2.0L when they really push it. Still fairly inexpensive, and about equal to a Mitsubishi 16g.

Most DSM turbos aren't all that great on a Honda. The wastegates are all set from between 11 and 14 PSI, so they usually need some work before being used on a Honda. Most of my experience is DSM related with turbochargers, so some others could answer better than I could about what works well on Hondas.

Like TehJustiN said, any turbo can move what your goal is (pressure-wise), but what you need to consider is how much air you want to move at any given pressure, and how hard you want to work your turbo to make that airflow occur. Pushing a small turbo too hard makes too much heat, and pushing a big turbo can be uncomfortable to drive on the street. Look up the sport compact car issues titled suck squish bang blow (I think they're from 2001). It describes very well how to match a turbo to your engine's flow characteristics. Good luck finding that series... maybe you'll get lucky if you google it...