Wolf : first of all, your tin numbers are either wrong or you are using multiple mods to generate tin. I've mined much larger areas than a single quarry can cover and have gotten a lot less tin using Tekkit. In that modpack, only IC2 is allowed to generate tin.
Second, the fusion reactor is not worth it for the iridium production because you have to spend 300 hours before it even pays for the iridium used to construct it. (ignoring the mountains of other resources needed)
On the other hand, a lame geothermal generator spam farm doesn't require any iridium. That's "only" 204 geothermal generators : could spam that in a couple days.