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I think you will be happy with a semi-auto, but I highly recommend steering clear of those capable of chambering 3.5" shells (12-gauge). If you go with 12-gauge, choose one chambered for 2.75" and 3" shells (or just 2.75" if you're only going to use it for clays). You will probably never need to use 3.5" shells. You might want to research for yourself why 3.5" chamber 12-gauges are not the optimum choice. Just my 2 cents.

I use 12-gauge and Light Modified choke (Improved Cylinder is okay also). Nothing wrong with 20-gauge (if you're a pretty good shooter), but I don't recommend a pump for sporting clays.