Would something like this be suitable? http://www.jaycar.com.au/productView.asp?ID=ZT2466&keywords=MOSFET&form=KEYWORD
The other N-channel MOSFET's are like $23 each, and waayyyy overkill for what I need.
Basically, I have 4 RGB LED's.
All the red dies are in series with a 1 ohm resistor (to run on 12V), and the green and blue dies are in 2 series strings of 2 with a 15ohm resistor to run from 12V. They are common anode LED's, and basically I just want to be able to control the 4 LED's (At the same time, as they are all in the same colour circuit) from 3 PWM outputs.
The total draw for each colour is 1.4A, at 12V. So I need to find a transistor/MOSFET locally that I can use to PWM the LED colours.
I have some TIP41C's, but they would require around 100ma base current to drive a 1.4A load correctly, which is more than the Arduino pins can supply, but I really want to keep the component count as minimal as possible.