Please advise espresso blend

Dear coffee professionals,

Several months ago I and my partner opened mini cafe in Ukraine.
I apologize in advance for possible stupid questions because I'm just beginner in this business.
So far we were using Ionia Gran Crema for our espressos... By reading this site I realized that coffee stored somewhere for several months is not the best choice to use so I found local roaster. The thing is they either offer origin coffees or their own blend which is pretty chip and supposedly not high quality (because of the prices and yet low coffee consumption culture people here usually tend to buy chipper coffee). 
So my question is whether someone can suggest a good blend for espresso. Something like classical blend or the one that most Batista agree is good so I would be able to order it from roaster. Again my question might seem totally unprofessional and in this case please advise me the link or book where to start on this subject.

Thanks in advance.

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