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I have a QNAP TS209 II Turbo and am very pleased with it. Had it for a couple of years and not had a single problem with it.
They don't make that model anymore (unfortunately, because it looks awesome!) but there are alternatives that have just as many if not more features than you could ever need. Two or more drives and you can set up RAID. They have a built in print server and also DLNA (the main reson I opted for a QNAP as only a few years ago this was something very hard to come by).
I would recommend one, and a dual drive such as the TS219 would just fit your budget.