I have a 2470 and can agree with bucket they are great boats, and the 2570 is more of an express with no walkaround and slightly wider beam. I have not a seen a 2670 but you should know that the 2570 is actually a shorter boat than the 2470 even though the model number would imply longer. Evidently in the early 2000's, ABYC the governing body about boat standards changed how hulls are measured and decided that if any hull component was bolted on, such extension of the boat length by virtue of the component is not including in the overall hull length, but if the component is fiberglass molded to the hull, then such extension of the boat length is included in the overall hull length. Within a few years of ABYC making this rule change, Pursuit and other manufactures decided to mold in their bow pulpits instead of bolting them on, which adds roughly 30" to the hull length. Put another way, the 2470 is 24' 7" from transom to the bow excluding the pulpit, and the 2570 is 25' 7" from transom to the end of the bow pulpit.
best of luck. DAJ