Difficult one Fran.... I'm lucky to find just about any brand over here, from Humbrol (still my favourite), Tamiya, Revell, to 'specialist' ranges such as DACO's,... but I still use a mixture of other products such as wargamer's paints, automotive paints, artist's paints (oil, acrylic and water-based), craft paints (Pébéo)...
Some of those are more expensive than 'traditional' hobby paints, some are not. Artist's paints are not an end in themselves, as you'll still need a base coat (acrylic preferably) under.