I have an old Durst M800, maximum size of film 6,5 x 9 cm, a great enlarger, heavy and very stable, with a Rodenstock Rodagon 80mm lens. Not very expensive these days in second hand. If you want more possibilities for the future, a 4x5" enlarger may be a better choice. The Ahel 12 is an affordable 4x5 enlarger too.