New Build plate

Been thinking about a new aluminum build plate, a machined one, super flat, what I'm wondering is, one is it worth it? like 70$ for the plate, and 50 for new mat, and then new magnetic stick on?

Also, I have seen several types, some are "MIC6" some are machined aluminum is there a difference?

I tried glass on top of the OEM, and it was only marginally better, not sure if it's the build sheet (the magnetic top layer) or the printer just sucks!

I bought a digital dial gauge and was able to get a lot better, but I still can't get a "perfect" first layer!