If you’re buying 10+ units, consider e-mailing a couple of places with a rough specification and get a quote. Maybe they’ll throw freebies at you - can’t say no to a free mug / mousepad / hat ;p
what to do if it breaks
Warranty & RMA cover that.
- a quality PSU might come with a 7 year warranty
- a quality Solid State Drive 5y
- a GPU - I wouldn’t count on something longer than 2y; albeit it may just work fine for the next 20 years… but its age will render it utterly redundant for production work after 10.
If you’re buying 50 PCs, one of their GPUs will almost certainly end up with whining coils (makes high pitch buzzing noise under load) - say goodbye to a quiet classroom (if such thing exists). GPU manufactures / retailer will replace it under RMA even though the unit is not actually broken.
Don’t pay more than $200 for a motherboard.