If you're looking for a simple stick vacuum with exceptional performance, save some money and get the $180 Hoover LiNX. The $500 Dyson DC59 is a great high-end option if you want a variety of brush attachments and other special features.
The Ergorapido is a nice-looking, easy-to-use vacuum that's in the wrong line of work. It's a vacuum cleaner you'll enjoy taking out of the box, then want to put back into the box once it starts struggling to actually clean your floors.
The Electrolux Pure i9 sees and avoids potential obstacles while it cleans your floor.