This honestly sounds like a perfect case for a business connection. Not only does it give you a static IP without NAT, possibly in an address block with other high paying (==reputable) people, it also bumps you up a lot in terms of customer service and service availability. Usually the first two questions in an outage are "how many customers are offline, and are any business connections impacted".

That assumes the ISP is willing to run a business connection to a residential address. Not every ISP will, especially if you're just a home user with special requirements and not an actual business.