So now that I've got wheels on order, I'm getting new rotors for them.

On my road bike I have a cassette for each set of wheels... but that ain't happening on the MTB. The SRAM 10-42 X01 cassette is like $320!!!

I could go get a GX level cassette for like $100, but that's worse than what I already have (which is OEM only and in between GX and X01). Even the cheap cassette is about twice what I'm willing to pay.

I am going to get the fancy floating rotors with the Ti bolts, though. They're not that much more expensive. Brakes get so much use on a MTB. They're like my fav thing on the bike, which is weird, for sure.