A solid home server handles your media streams, backups, and storage for years. You want to buy or build something that lasts five to seven years so you buy once instead of twice.
Server enclosures and drives follow a predictable release cycle. When new models drop, last year's version usually goes on sale and works just as well for home media. Timing these tech site sales gives you a much better system for your cash.
Remember that a 0% intro window is a firm deadline, not free money. If you still carry a balance after the 18 months end, regular interest rates kick in on whatever is left, so stick to your $50.00 monthly target.