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60% keyboards
Best for: small desks, portability. Downside: you lose dedicated arrow keys/function row.
TKL (Tenkeyless)
Best for: most people. You keep arrows and function keys, but save desk space vs full size.
Full size
Best for: heavy spreadsheet/data entry (numpad). Downside: big footprint.
My under-$60 picks: Best Mechanical Keyboards Under $60.