What diff bushings to get?
 

Im looking at MMR's and energy suspentions. THey are both $50, so which should I go for?

I can't suggest either. I can suggest you buy from these guys if you want solid mounts and you want them quickly http://www.driftingjellyfish.com/
Same price but you don't have to wait forever for MMR to get your product out to you.
Hopefully.

I like :)

delrin would be better than UHMW. delrin has some self lubricating properties that UHMW doesn't, less noise.

I have the mazdaspeed mounts. they're adequate.

that would be good only for a suspension bushing. the differential bushing shouldnt have any friction points that would benefit from that so moot point.

IDK my mmr motor mounts took no time to come.

same here, just a few days

He doesn't really have a stable shop anymore so it's harder for him to make things. I've seen people say it's taking a month or more to get things now but maybe things have changed. Here is the website. You can try.
http://www.mmr-direct.com/

imma go with the jellyfish ones, $5 cheaper and the diff isent moveing, no need for delrin. Anyone have experence with these?