You are the only judge of your tastes. But, you will also be learning a machine, assuming you are new to the whole espresso preparation thing. So, a coffee that doesnt taste so good may be to do with technique rather than bean quality.
The sensible course of action would be, while you are learning your machine, to stick with one bean type and learn to make good coffee using only it for the next month.
The Peru Ceja de Selva Estate from Beanbay is not a bad start.