Go for AULA F75 variations, the key sounds are good on it, and obv looks and feel are premium. Plus the knob for sound looks good too. If you are into gaming, then go for Razer black widow.
Most of the cases buying a new one is better. Make sure to test the psu if you are gonna buy a used one tho. Seen a lot of mates getting a faulty one, initially it ran good but would soon stop working.