First of all, I am a drummer, not a keys player. I want to invest in a sampler/synthesizer to add sounds to our band(without having to pay and deal with another member, of course

SO I need some kind of synth that would allow me to play a few keys, loop it and play it back. More importantly, I would like the ability to pre-record a backing track so I can hit play and it would play throughout an entire song.
I was at the dreaded Guitar Center today, and checked out a few of the synthesizers they have, namely the Korg Microkorg, and I think that it is what I want, but I need to KNOW what equipment I should invest in. Any advice is appreciated.