[traveller (Bo)]

Hi all, I have been happily using a Baader modified canon 40d.
Now I am tempted to get the canon 1100d and modify that as well.
I am tempted to do a full spectrum mod for the 1100d, either with a replacement clear glass or just leave the sensor exposed.
Obviously if I replace with a clear glass I preserve the refractive index and therefore the auto focus function, the other advantage being keeping the sensor clean.
What are the other advantages are there?
A naked sensor is more vulnerable but also cheaper, but misses out on the auto focus.
Are there anything else I should be aware of?
What brands clear glass replacement filters would members recommend?
Cheers,
Bo