davivid:
Brilliant didn't think of looking up the schematic for that. So in that case I will use LMV358's and a 1K series resistor with an LED on Pins 11, 12, 13. And that will still enable me to program it using ICSP right?
http://arduino.cc/en/uploads/Main/Arduino_Uno_Rev3-schematic.pdf
If you are going to use three LEDs you will need three op amps.
One 324 (quad op amp) might be better than two 358's (dual op amp).
Or you could follow Lefty's advice and use three mosfets like the small 2N7000.