Infra red conversion

I have 2 canon bodies that i don't use a lot, 30D and 50D. I was thinking of converting one for IR. Wich one should i choose ?. I think 50D will be the best because of the live view.

Also there is different company in north america that does this conversion and different type of conversion ( i mean different filter installed in front of the sensor(

SO your advices and name of company are welcomed

thank you