Easiest and fastest way for an amazing single cup of coffee is probably the clever dripper. It’s utterly fool proof, and combined with good beans and a good grinder makes top shelf coffee. Also it costs almost nothing.
If you are looking for a batch brewer that will last the rest of your life go for Technivorm Moccamaster. I’ve had mine for 10 years and wouldn’t want to live without it! Good grinder and beans needed of course!