You won't go far wrong with anything from the ample selections offered by
Has Bean or
Square Mile. The Has Bean Espresso Blend may well be to your taste if you prefer something with a bit of ooomph, though with a little sampling you may find yourself also enjoying lighter roasted offerings that are still able to deliver all the flavours and mouthfeel.
For something with a bit of muscle but still quite refined you may find yourself enjoying the
Happy Donkey blends. For my taste, the Brazilian is actually a little more rounded than the Italian in their range and it also offers a bigger kick.
Another well thought of supplier round here with some popular blends is
James Gourmet Coffee.
Not many on the forum use imported coffee because of concerns for freshness. That is not to say all imported coffee is bad, just that the majority prefer to buy freshly roasted from a known source with clear roast dates. Mooch around a bit and you'll get a feel. Hopefully you'll eventually find something that you really enjoy that is readily available, fresh and from a reliable source