Idpa, things like that. Shoot and scoot.
Even among the runnin' & gunnin' games, there's no single perfect revolver. The best all-arounder, IMO, would be a moonclipped 4" S&W .45acp (models 625/25). If you don't reload, though, it can get expensive.
If I were to buy a revo purely for Steel Challenge or ICORE Limited, it'd be the 8-shot 627.
A 4" .357mag (e.g. 686 or GP100) is a great choice for IDPA SSR & ICORE Classic, but not as good for USPSA. In most cases, you can shoot .38spl, so the ammo's cheaper, and has less recoil.
As far as conversion to DAO, the lighter hammer allows one to tune the action a bit more aggressively, but I wouldn't worry about that initially. You
will need a front sight you can actually see, though, so at a minimum, I'd install a fiber optic front sight. Next highest would be chamfering of the chamber mouths and smoothing of the action by a gunsmith. And while I'm a big fan of dry fire, it's no substitute for a
bona fide action job. As you progress, you can lighten the action and possibly convert to DAO.
The 4" GP100, 686SSR and the 625JM come with an interchangeable front sight, which is a very nice feature. I'd immediately chuck the front sight, and install an interchangeable FO. If you knew you were going to immediately send it to a gunsmith for a full tuning, I'd skip the 686SSR and get a standard 686.