IR mod

It seems most bodies converted for IR are the older 400D, 20D cameras. Any reason beyond them being cheaper? I plan to permanently convert it so it seems like except for having a live view (on the newer cameras) the same factors would apply shopping for a body if I were not planning on converting it. Just want to make sure because when looking for a deal on used gear, you often have to be flexible on exact needs to get a great price.

Supposedly the older cameras are more receptive to IR, but that only matters if you're not doing a conversion and just adding a dark filter.

If you're doing a conversion I don't think it matters if you use an old body vs a new body, I'm guessing most people just use old bodies because of the price.

You can also get one already converted from Canon the 60Da, which replaced the 20Da.