Alright. Heatsinks.
In the end, these are the ones we're getting for the thumbs. All the thumbs will come with these.

As for the 8 boards, considering a few options. One is two have two of these guys on the back like so. These are pretty great but they are quite expensive, will come in at $17 for the pair.

Another pretty good looking option is these guys. Will be cheaper and probably pretty good, though we don't know thermal details. This will be $10

Let me know your thoughts on these. We will need to order them very soon. Will probably be easier if we just get a bunch of the same ones, so perhaps the cheaper ones will be more universally appealing, though i guess two options is an option. Can i get a show or hands?
Cheers
Barntech