Ovata and Argentea are a lot of times used interchangeably when it cones to the crassula family. It looks like a Hummel's, but sometimes it's tough in low light, such as at stores, because the colors don't stand out. But, the red edges and slight cream color tell me it's a Hummel's.

Joe

Thanks Joe! I'll get it into some proper soil and cross my fingers :)

It looks like it could very well be 'Hummel's Sunset', as Joe said. You might have to wait for a season change (warmer/cooler weather) to get a more noticeable color change. Also, as mentioned, argentea is the old species name used. It has been ovata for quite some time, but they still use it.