The Takumars & SMC Takumars are great lenses, I also have some Tamron SP lenses the advantage is I have ES/F M42 adapters as well as K/M mount so can use them on my Spotmatics or bayonet mount Pentaxs & Chinons.

There was a great f2.8 28-90 S1 Vivitar lens not strictly a zoom, also a 28mm f1.9 S1 and I'd like to get them in screw mount for my Spotmatics, they rarely seem to come up for sale. I had the early S1 f3.5 70-210 zoom which is every sharp and again worth buying.