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As Patrick said, 38Super is still very popular and very competitive.
38SuperComp may be a little better choice, in some opinions. It doesn't have the semi-rim the 38S has, thus many feel it stacks in the magazines better. You may be able to get one extra round of 38 SuperComp...or, at least a bit more space in the mag to allow easier mag seating.
9x23 (also rimless) is known for it's strength.
38TJ...rimless, also strong, and desinged around the extraction groove a bit.
Since you will be buying your brass anyway...any of the above are viable. I'd choose one that my shooting buddies weren't using. That way, I'd be more likely to get my brass back. That may sound weird, but if you hve 5 guys at your match and they are all shooting 38S, you are going to be mixing brass. (Of course, you can mark your brass too.)
40 isn't popular in Open. Not at all. You lose capacity and don't have as many bullet choices in the right bullet weight for Open guns. I do have a good buddy that does run 40 in Open. He will probably make Grand Master next year. It can work. Then again, so could a Glock open gun.
9mm is an option now too. But, many of the smiths aren't fond of building on it. It's a short round for the 1911/2011 platform. The idea of going with 9mm is to save on brass cost. Some feel that is a false economy. Maybe they don't pick it up because it is 9mm. Or, maybe they don't get as many loadings out of it. Or, maybe they don't know the history of the 9mm brass that they do pick up.
Since you load for 38S already, that should factor in one way or the other. One way of looking at it is to load a different caliber, to help keep your open gun loads seperate from your current loads. Another way to look at it is to stick with all similar componets, to make purchasing reloading components a bit easier.
As a point of reference, I shoot (non-open) 40 in Major and in Minor power factors. Since all my components are the same, my loaded ammo needs to be very clearly marked. I use completely different boxes for the different ammo, for instance. That helps me to keep my ammo straight. I might not read a sticker as closely as I should, but I can tell a grey 50 round ammo box from a green 100 round box pretty easy.
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