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Ones like these will work very nicely:http://www.solarbotics.com/products/qrd1114/
I have some of those sensors (from sparkfun though). I can vouch that they work at greater distance than 6mm. (I have used them as proximity detectors for distances around 30cm. running them through a decent transistor will produce a better output range)
Obviously it wont produce a digital high. But out of my 10bit analog input I get a reading of 997 for a distance of 2mm ranging to a reading of ~61 at just over 30cm. Any further and its too noisy to stretch.
The diode really helped reduce the noise to the point that it really made the sensor work.
How would a diode in that place reduce noise?
sacrificing virgins are so much more fun