I'm looking for a mid range boiler, with descent performance. I have
looked at Biasi, Baxi, Ideal etc...

Make sure it is condensing and at least 28kW, preferably more.

Good midrange makes with good condensing products include:

Ideal.
Worcester Bosch.
Vaillant.

There are others. I believe even Glowworm are slowly recovering their
reputation with their latest models.

Christian.