Simultaneous recording interface advice?

I’m looking for an interface capable of recording a fully mic’d drum kit. My current interface is an Alesis Multimix 8 and only outputs stereo left and right making recording anymore than two things at once impossible. I just want something that’ll let me record a drum kit so that each mic has it’s own channel in cubase. Basically I need a real interface and not a live mixer! Haha

I’m running Cubase Elements 7 on an imac, with os mavericks 10.9.4 . Connection is USB. Any advice would be greatly appreciated. My budget is about £300