I’d really like to try the new Advent X drivetrain! I’d go for the 10sp personally in the interest of staying as modern as possible, and it’s not like it costs a whole lot more! I’m not sure about the Alivio crankset though, I think you’ll have trouble finding a chainring for it on the affordable side of things. Race Face Aeffect is probably one of the cheapest cranksets you’ll find, and the steel chainrings are super cheap. One other option you might try is to find a Sram NX eagle crankset new as a take-off from a stock build from some mtb classifieds. It’s the sort of thing that many people will upgrade right away and you’ll be surprised how cheap you can get them brand new.
As for brakes, Shimano MT520 or Sram Guide RE brakes are both super powerful for the money and would recommend either. You can see what I think about both here and here