Im in the transition from BMX to Mountain Biking/BMX. Since i moved from Ny to GA theres ALOT more hills and my BMX bike cant handle it anymore. So whats a good bike for a 5"7 120lb person? I will be going up nice hills and JUMPING!! Speed is a plus! Just want to get an idea of a good begginer mountain bike. i do like the DK series bikes because there like BMX bikes