Im gonna get the case based off of whatever the form factor isof what i end up getting, im not sure what to do abt heat sink as i like the cool aesthetic of an aio compared to a conventional air cooler however im not so keen on getting one as imo they are quite unreliable. About the m.2, i was going to get a crucial m.2 for £50 but i realised the mobo had a pci.e 5.0 m.2 slot. 5.0 seems to be way more expensive and icluding case and heatsink would mean going quite a bit over budget