MH lose $5K in value each year from the time they are driven off the lot. If you have the money to purchase a new one, great! But understand that even though its new and has a warranty, you'll find yourself laying down cash for repairs and the like. So the better deal you can get on the front end, the better off you'll be on the back end if you get a coach that has little if any issues while you own it.
Remember that a dealer typically floor plans his units due to their cost. So the longer a unit sits on the lot the more anxious they will be to negotiate a deal. But remember too that the longer it sits, the more interest they have been paying on that unit and their margins grow smaller and smaller...hence you need to know what the magic tipping point is as to when they are willing to discount deeply so they can avoid paying interest and still turn a nice profit on the unit. Sometimes its 30, 45, 60, 90 days depending on their floor plan contract. (This also applies to cars, trucks, motorcycles and ATVs)
If you can afford NEW, then look at those which someone has purchased and traded back in to get either something bigger or smaller yet to better meet their needs of desires. You'll save a great deal and still have a new coach. A friend of mine just bought one, a 38' MH saved thousands and it was only owned for 30 days with less that 200 miles on the odometer. It was used once, for a weekend test run. The owner decided it didn't meet his needs and traded it back in to purchase a 42'r.