Speaker Sensitivity AND Power Requirements

Hi again all, thanks for all the good responses. Here are the answers to questions asked.  My man cave is actually pretty big, it's a basement of sorts and is just over a 1,000 square feet.  My gear is a few feet out from one of the long walls and my work table is about six and a half to seven feet from my speakers. These are older Yamaha stand mounters. NS-A 915 YS. They say they need a minimum of 10 watts and can handle up to 120.  I play music while I'm working on my hobbies, It's background music and not dedicated listening as in my main system but I still want the best sound possible. I know everyone here gets that. 
My main taste is heavy rock, Scorpions,Zeppelin, Sabbath, The Who, UFO, etc.  I also love the softer side of rock too, Elton John, etc. Blues, old school jazz, oldies and some classical round out my likes. My cd player in the cave system is a 5 disc changer Yamaha.  This current set up plays nice and it easily gets loud enough as most of the floor is cement.  I did put a throw rug between my table and the system. I was mainly looking at the Wharfedales due to the fact that they are so heavily discounted and I like the sound of my floor standing Wharfedales in my main system.  More comments are appreciated.

Generally speaking, In that room 22 watts usually would not be enough with speakers at this level of inefficiency. The thing is, this speaker does not handle a lot of power and in that regard your receiver is a perfect match. So if you plan to be close to the speakers and only using them for background it will work fine.

I have them, along with a pair of Elac Debut 6s. The Dentons will work best if you feed them some power, even at lower listening levels, the dynamics and punch in the midbass will come through. 

Thanks guys, I think Music Direct has a pretty good return policy. Maybe I should get them and see how they work.  Not ready to replace the receiver. It's in mint condition, generally sounds pretty good, and reminds me of my start in this game. 

@zar IMO I would pick up a pair of Klipsch speakers (your choice of model since they will all work well) that way you are good to go with 22 wats per channel or any other amp.