Both the Sea Ray 540 Sundancer 2011 and the Sea Ray 580 Sedan Bridge 2013 are semi-displacement designs, both built in fibreglass, so the buying decision usually comes down to a handful of practical questions: how many people are you putting on the water, how far do you trailer, and what does your tow vehicle weigh?

Size is the most obvious dividing line here. The Sea Ray 580 Sedan Bridge 2013 measures 58,6 feet overall (2013), giving it roughly 3,8 additional feet of deck space compared to the Sea Ray 540 Sundancer 2011 at 54,8 feet (2011). Weight tells a clearer story for trailering families: the Sea Ray 580 Sedan Bridge 2013 tips the scales at 51 500 lbs - 1 500 lbs less than the Sea Ray 540 Sundancer 2011 at 50 000 lbs. That difference is meaningful if you're working within a half-ton or three-quarter-ton truck's tow rating, especially once you factor in a motor, gear, and fuel.

The power gap is worth calling out. Rated to 861 hp, the Sea Ray 580 Sedan Bridge 2013 has a 146-hp advantage over the Sea Ray 540 Sundancer 2011's 715-hp ceiling - enough to notice on acceleration and at cruising speed, particularly with a full passenger load. Fuel capacity breaks the other way: the Sea Ray 580 Sedan Bridge 2013 carries 700 gallons versus 600 gallons in the Sea Ray 540 Sundancer 2011. On a lake day that's negligible, but for coastal cruising or long reservoir runs the extra range matters.