There are lots of different hardtails suited to lots of different riding. It would probably be useful if you had a stab at answering some questions like this before being recommended a bike:
Where do you live and where are you intending to ride it?
Do you have any aspirations to cross-country racing, or primarily recreational, for fun/fitness?
Do you like the idea of riding ‘technical’ i.e. tricky terrain, or would you stick to smoother routes?