3v0,
If you get a chance, please look at the Micrel MIC4682 smps 'buck' regulator. It's a 2 amp regulator with current limiting capabilities. The little 1.9"x1.9" evaluation board in the Data Sheet includes jumpers for selecting voltage (1.8, 2.5, 3.3, and 5.0v) and current (0.6a, 1.0a, and 2.0a) and the formulas you would need for coming up with other limit settings.
It may seem like more work and a larger investement on the "front end" but Micrel (MIC4682) and Coilcraft (DO5022P series) will sample and you'll end up with a very versatile SMPS regulator sub-system for your breadboard experiments.
**broken link removed**
Happy Holidays.
Mike