The 1026 and Double Eagle have 5" barrels and the 1076 has a 4.25" barrel. Both have 9-round magazines available, but standard Colt magazines hold 8 and are the same as the Delta Elite's. S&W had a problem with their decockers at first IIRC and did a recall. Some of the S&W pistols have MMC-style adjustable sights and some have Novak sights, while the Doulbe Eagles have standard Colt sights. Accessories for the Colt will be pretty much non-existent, while there should be plenty for the S&W pistols since they are the same frame size as the more popular 45xx series pistols. Otherwise all 3 are good pistols without any particular problems or quirks to worry about.
If I had to choose one I'd go with the 1076. The Double Eagle is pretty esoteric and it will be a much bigger hassle if you want to get accessories or replacement parts for it later.