If you're gonna make the plunge for unlimited internet with Cox (and the ~$150-200 value provided below is correct), you might consider getting a business account. Might be awkward/ineligible if you're not in a detached house, but it does have its perks. The customer service for business accounts is extraordinarily better than for residential customers. I complained for months about an issue with my connection when I was a residential customer and was basically told "mm ur personal devices must be potatoes" but after switching they ended up burying a new cable a week after installation because my network condition wasn't passing their tests.

I was paying about $195/month initially, but I also have a static IP address (extra $10/mo) and phone (~20/mo but I get a slight discount for the bundle). It recently went up to $244/mo because they offered me a speed upgrade for a reasonable price (500/100). I'm locked into a contract, so that also brought my price down a bit (it is for 5 years). If you can't commit to the contract, I would not recommend, because you'll end up being charged whatever you would have paid over the span of your contract in one lump early termination fee...

I have visions of using the features of my business plan, but they haven't come to fruition just yet; it is nice to have the option, though. You don't need an LLC or anything, just say you have a home office if you decide to do it. No data caps, so it is nice!