but I am planning on making it external with adapters and what not!
Make sure that the adapter you get supports optical drives and has an external 12V PSU.
I use an LG BH16NS55 myself. My best drive.
If it is just for this you can use pretty much any drive just make sure it supports Bluray XL although any on the market right now should do so.
Unless I am mistaken any Bluray birner can burn MDisk Blurays just fine. Unlike M Disk DVDs they do not need a special laser.