Have to swap out Comcast modem (rental) - which one to ask for?

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our cable internet has been anything but reliable lately and after several excrutiating hours with the less than helpful Comcast agents, I've been instructed to swap out the modem at the local service office.

Anyone know if there's a Comcast supplied modem that's noticeably better than the others? The one I have is a Scientific Atlanta (not sure the model).