A bit of a loaded question. Usually your best option when it comes to accuracy is a set of studio monitors in a treated room, but for headphones, It depends on your budget, and where/when you plan on listening to them.

While the 280 pro's are still considered a decent budget option for monitoring and listening, I don't think they're anywhere close to accurate. As for a broad recommendation for "accurate" listening while not costing more than a car, the akg k612 pros with a decent amp/dac seem like a good option.