I have a theory that on motorhomes (or almost anything complex with lots of choices) you don't know what you want or don't want until you have had one. So, if this fellow is buying his first, I would suggest that he start making a list of must have, nice to have don't want, etc. This list can be based on friend's advice, sitting in motorhomes (preferably without the salesman talking in your ear), and by reading motorhome and FMCA mag. Then try to rent one reasonably close to your ideal, and see how that changes your list!
Now, to new or used -- as has been pointed out, if you're buying with no trade, you ought be looking at a price about 25% off MSRP. Using that as a guide, the starting price on a one or two year old coach in very good condition (which may be your best deal), should be a good deal less than that.
So, now, knowing what you want, and some idea on pricing, you should be ready to enter the "den of thieves." Stick to your guns on both features and pricing, and you may come out unscathed!
Duncan, 2012 Itasca Ellipse 42QD
2014 Honda CRV, wife and cat
Florida and South Carolina