The ATX235 & AF 193 are both very good. Just remember to stops down a little. If i were to choose the AF193 is a better one.
I would also recommend the original Minolta 20mm F2.8 Prime lens. This is the best 20mm wide angle I have use. Avoid the Minolta 20-35mm F3.5 zoom. Do not produre good photos. A second hand Minolta AF 20mm F2.8 cost about $600. I have bought one used at a good price of $400. So thats all depends on conditions.
Regards,
Michael