hello!

I need your help!
I'm looking for the best bike arround 600 dollar. I think te next bikes are fine, but would you please tell me what is the best bike for my money and why?

GF Tassajara, $600 in my LBS
Specialized Hard Rock Pro Disc $650
Specialized Rock hopper $450.00
Raliegh M80 $550.00

Any other suggestion?

Thanks a lot!