Dave,

Why do you think a phototransistor is "complex"?

I connected it just like you show it up in your webpage and it works. I have connected a BC237 to amplify the phototr's signal but this doesn't make it more reactive.

The only problem is sensibility. Or am I wrong and maybe I should measure the sensibility another way?

I don't know to make it better...

Nevertheless, I'm going to by some IR modules to make some tests.