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Good choice on the Shadow but it will be to heavy for IDPA. The best I have been able to do with mine is get it to 39.2 oz. May have an idea to get the last .2oz off of it.
A little redundant but I would have gone with the 75B or its stable mate the CZ85 with trigger jobs by Gunnar. The 226 will work for IDPA. Some guys swear by the model.
The Shadow is an excellent choice for IPSC Production.
You won't be sorry with either of your guns they are both excellent choices.
Of those three, I would pick Beretta, unless you've got small hands. It's just as reliable as the Glock (both are more reliable than CZ) but more aesthetically pleasing and more fun to shoot due to much better trigger and softer recoil.