Have a look at the Leitz Valoy II, one of the nicest 35mm enlargers. It will take any lens and will do 16X20 plus or minus, depending on yes/no easel. It has the beautiful condenser system, pressing the negative to the negative holder (like the Focomat 1c). The later dark grey and light grey models came with the anti Newton treated condensers (frosted glass). Best to get one with the red filter, because that you can modify to be your filter holder. Here in Europe they go for €25 to €75 . . .