You question is too open. It almost like asking what type of shoes you should buy. Until we know more about you and what style of riding you like to do its impossible to answer correctly. Do some research on the different types of bikes you like. It doesn't have to be that in depth, but you can start by asking a few questions first.
Look around at the people like yourself or the type of riding that you want to do. At least that will give us some way to narrow your choices. They decide on whether you prefer a road, mountain, hybrid, etc. bike. After that, you need to decide on a budget. That alone will get you half way to getting better suggestions and choosing the right bike.
Last edited by KraneXL; 02-16-15 at 01:04 AM.