As you know,I've just sold my mastatron! And I'm kicking myself π i do have a tech 21 red ripper which is worth a look if you can find one. I deliberated between the two and the red ripper is more versatile, but takes a lot more tweaking to get a great synth sound out of than the mastatron,when mixed with octave and filter.
3 leaf doom too or a Crowther prunes and custard,they are on the more expensive end though π