It would be extremely hard to pull a better shot of espresso with any less effort. The Breville Barista Express is among the more user-friendly espresso machines on the market — semi-automatic or otherwise. Full stop. And around the $600 mark, it surely stands alone, for now.
I'm also a big fan of the Gaggia Classic Pro, which is a little more hands-on for those more curious about perfecting their skills, but that also makes it a more temperamental machine (you can break it, but then you can also fix it). The biggest issue with the Gaggia, though, is that it's the same price as the Barista Express but without the built-in burr grinder, which is going to cost you at least $100 for a decent one.
If you really prefer a hands-on experience, check out the La Pavoni Europiccola, but it's a bit pricier and far more finicky (leave this thing on, and you'll be sorry).
Likewise, if you want to get meticulous with your java routine while saving a couple of Benjamins, the Flair Espresso (I recommend the bundle) is a manual device that pulls the best damn shot of espresso I've ever made, but only when I'm on point. It takes some practice, and if you're making espresso for any more than, say, two people, it can really compound into a headache. The pros, however, are not worth ignoring: It's portable, and it requires no electricity (supposing you can acquire hot water otherwise).
And, if you want real espresso but are on a budget, a stovetop is a timeless classic. Bialetti is sort of the household name, but they're using cheap plastic handles these days that work fine until you forget your pot on the stove for a couple of minutes too long, and then you've got to order a fresh one. Grosche makes our favorite, but here's our guide to the best stovetop espresso makers you can buy.