What else do I need if I go this route?
 

I have a 95 miata, it already has a wideband, ms3x w/ gm iat, 2.5 inch exhaust, upgraded clutch, and ev14 injectors.

I'm looking at the following path to finishing the turbo build for a budget build:
ebay T25
Kraken manifold/downpipe/oil/water feed & return lines and fittings
cx racing Intercooler/bov
MBC
boost gauge
Egr block off plate

Total for finishing this looks like it would be right under $1500.

Would I need anything else?

FTFY

The list looks pretty complete though.

My $.02: there is absolutely nothing wrong with a properly installed quality mbc.
nothing. at all. even on ms3.

*edit: btw I still remember remote tuning your car n/a last year :)
feel free to hit me up via email, here, fb, or on ig if you have any questions

I can't think of a single benefit of MBC for OP's situation.

Please teach me.

I never said there's a benefit. I said there's nothing wrong with using one, that's all.
I have done a/b testing personally and cannot see any difference in performance when both are set up properly.
So with that said, owning an ms3 if you set it and forget it, go either way. If you want to explore cool features like different boost maps, boost by gear, etc. then by all means go ebc.

Lately starting to see everyone hating on mbc's for no reason and feel like it's not really deserved.

The reason is that there is no benefit. They both work. One gives you more options with literally no downside.

Thanks for the responses guys! 18psi I appreciate that immensely. Hopefully I'll have the parts in the next couple of months, and I'll probably be looking to you to help me tune again. I didn't even think about boost maps, and adjusting boost in different gears, so that probably just pushed me into heavily considering an EBC. Hopefully I can get all the parts before the snow traps the miata and forces me to wait until spring for the install.

I personally use an MBC and it works extremely well. One small downside of an MBC is its very weather dependant, in that when its colder you will boost more and have to turn it down a little and when its hotter you might have to crank it a couple turns to bring the boost back up. With an EBC it should be very stable even with weather changes. Despite this small downside I still use an MBC.