i assume your talking about the 97-00 (non se) 270da and the '01-'08 280da - very similar - the 280 has a tiny bit more beam and is FAR more common with twins - most 270s were single 454 - a few were twin 4.3 - the most common 280 power is twin 4.3, but there are a lot of twin 5.0 and single 8.1 boats out there too - the layouts are basically the same - buy what you can afford based on condition, not year - the 280da is one of sea rays finest - the only real faults are a small gas tank, lack of storage, no real space at the helm for flush mt electronics and a water tank vent that makes the tank hard to fill (im nitpicking)