Except I would replace Apache by G.WAN. I'd like to know if it lives up to the hype. I'd install Lubuntu for the Linux distro, because it's light and easy to configure and maintain. Also, MariaDB instead of MySQL, if a database is needed.
But if you can get 250$ for it, that's the best option IMO. One of your four summer tires would be paid.
I'm not familiar with G.WAN, I'll have to look into it more. I'd also like to try Nginx as I've heard good things about its scalability and performance above Apache. I've also not heard of MariaDB. Do you have a short pro/con comparison between that and MySQL? I would also consider switching to PostgreSQL.
Thanks for the suggestion on funding my summer tires. As of right now they're already fully funded and I don't need to sell these servers to fund the tires. Now that I have two sets, they will give me more miles before having to replace either. You can never have enough stickiness to the road for increased safety.