Which mother board to buy for 24/7 hardcore gaming?

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It depends what you are using the system for. The B85 chipset was designed as an entry level chipset for business workstations. The Z87 is for gamers and enthusiast. I know some of the manufacturers have been redoing the B85 chipset models and adding some more features to try attract budget minded gamers calling the new version B85 Pro. I don't think you can overclock on the B85 Pro models. If you can afford all of the models listed I'd go for the Z87 model it's a better more feature rich chipset.
It depends what you are using the system for. The B85 chipset was designed as an entry level chipset for business workstations. The Z87 is for gamers and enthusiast. I know some of the manufacturers have been redoing the B85 chipset models and adding some more features to try attract budget minded gamers calling the new version B85 Pro. I don't think you can overclock on the B85 Pro models. If you can afford all of the models listed I'd go for the Z87 model it's a better more feature rich chipset.
 
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