Talk with a few dealers within a 300 miles. Colonial has a great selection and they seem fairly nice. Though they are not without issues from what I've read, that can be expected almost anywhere.
A 2004 base went for 39,100 approx, but the 2005s got a more stout axle putting the GVWR at 7300lbs. In the end the 25' SS is a great unit, with lots of storage and room. I like having a couch and a dinette. The bed can be a bit small, as can the head, but heck, that's why we camp-- to rough it a bit to get out of the urban jungle....now if we were fulltiming.......
17% off list is about average for most units. However, if you trade in the 16", you may or may not get 17% off list. It all depends on how hungry the sales folks are, how much alum they have on the lot and your horse trading skills. Spring is not a great time to horse trade since it's hot season for RVs, but from what I've heard, since gas went up past $2/gallon, RV sales have slowed a fair amount. Not quite stalled, but it has slowed....put it this way, Airstream was filled to capacity when I was there in Dec 2003. April 2005, they were busy and lots of units in production, but not as many as back in Dec. 03, so you may have that as your advantage.