Frigidaire Single-Serve Retro Coffee Maker: This machine from Frigidaire was speedy and did the job. It has no frills and is the cheapest option on the list at just $38. It feels and looks a bit cheaper than the others on this list, but will brew a cup of coffee in under two minutes.

Proctor Silex Single-Serve Coffee Maker: Proctor Silex's entry on this list is in the same tier as the above Frigidaire. While it’s slightly slower, it offers a similar budget-friendly price.

Hamilton Beach FlexBrew Single-Serve Coffee Maker: The Hamilton Beach single-serve option is still quite affordable at just $60, but it also offers an additional feature: regular and robust brew settings. In our testing, the robust setting produced a noticeable, albeit modest, increase in coffee strength.

Hamilton Beach FlexBrew Dual Coffee Maker: This coffee maker is essentially the Hamilton Beach single-serve model combined with a drip machine. The single-serve function performed similarly to its standalone counterpart. It’s slightly cheaper than the Keurig K-Duo, but the K-Duo feels more robust and brews a bit better.

Cuisinart Coffee Center Two-in-One Coffee Maker: The Cuisinart two-in-one Coffee Center brews both single servings and carafes with both bold and regular options. It has additional features -- like the option to keep a carafe of coffee warmed to different temperatures -- but in my opinion, it doesn't compare to the K-Duo. The K-Duo feels more solidly built and produced better results in our tests.

Keurig K-Supreme: The K-Supreme, like the other Keurig machines on the list, performed a bit better than other brands. It's a smaller option with a detachable reservoir. It has four size options and settings for strong coffee and brewing over ice. If you want a couple more options than the K-Mini, but don't want to inundate yourself, it's a good choice.

Ninja Dual Brew Pro: This Ninja coffee maker can do it all and was a close contender with the K-Cafe Smart for best machine for customizing. It can froth milk, brew carafes and coffee pods and even has a separate dispenser for hot water, all while having a smaller footprint than the K-Cafe Smart. In my experience and based on our tests, it didn't brew quite as well as the K-Cafe Smart, but at $180, it's a similarly priced option.