For WSPR, 5W or less is quite enough on 10m, even with my “compromise” 3 band PAR antenna. In the quiet years ahead, a bit more power would be helpful on SSB, AM, CW and FM.
I am now getting very tempted to buy a Lincoln President II (version 3) which can run up to 31W pep on SSB. Probably it would run far less most of the time. Nevada have reduced their price by £10 to £249.95, I hope that includes free delivery for cash.
This is a dedicated 10m radio, although it can also cover CB bands with a simple (but illegal) internal wire cut. If I bought one, I would only use it on 10m only: I have no interest in CB. I think the latest mods turn this into a good rig. On my original Lincoln President – sold years ago – some impressive DX was worked in quieter years even from the car on SSB.
Yes, it is a glorified CB rig, but with some very useful features for amateur use and about half the price of the lowest cost amateur radio transceivers. There are other contenders too but these seem to have fewer useful features.
As my main interest (outside the 6m Es season) is 10m, this may be a wise buy.