You will probably want to go for an "Emmelle" bike. do not. i repeat DO NOT get an apollo. they suck.
Most emmelle bikes come fitted with disc brakes and have front and back suspension and are very light. the only downside to these bikes is the fact that the seat isn't very comfortable but you can buy a gel padded one anyway.
Also dunlop are an ok make, but i've heard that the disc brakes can snap. but that was only someone that told me.