I have both a Nuova Simonelli espresso machine, and the Aeropress. I use the NS every day, but it's certainly finickier than the Aeropress. Unless you have a high quality burr grinder that is very consistent, I think you'll get the best results with the Aeropress. It's much more forgiving in terms of grind uniformity (you can even get good results from a cheap whirly blade grinder).
FYI, if you want some over the top reading, head over to one of my other favorite websites: home-barista.com. Folks there debate over water temperature profiles in the espresso brewing process to a tenth of a degree, grind dosing to a 0.1 gram accuracy, and all kinds of other crazy stuff. Even they have uniformly good things to say about the Aeropress as a way to enjoy coffee.
In terms of beans, I've been enjoying the work that Verve Roasters out of Santa Cruz have been doing, especially the Streetlevel. I brew with beans that are between 5 and 15 days old (roasting age) and are ground immediately before brewing (1 minute or less).