Yeah, go with a Denon refurb (from ecost). I have 2 refurbs from them and 5 friends have also bought their Denon refurbs. Nary a problem. Actually better than new from the standpoint that the problems have been fixed.
You get a 90 day warranty and can purchase another year for cheap.
the 1905 or 2015 would be a better choice than the 1705. The 1705 has a toggle on/off and the 1905 & up has separate (discrete) on & off.
Don't concern yourself about the watts, you won't notice the difference and there is more than enough power.
Good luck with it.