More Power is always good?

Hi all,

I'm a little lost in my search for the amp. Does more power (like more than 100W) means good?

I have been around listening to various amps, maybe a little too much that confused me.

Say for a room of 16ft by 20ft. What is the optimum power requirement?

For example, once I heard the Sugden A21Se (Class A 30W) driving the Spendor S6E, everything was nice except that I found that the basss definition and extension is lacking which is a concern to me, the showroom was smaller than my room. That's why I'm looking for amp with more power (like 100W), am I wrong? Will Class A amp like Sugden MasterClass or Accuphase E530 or Lavardin or others similar amp with power rating of 30W-50W be sufficient?

by the way I am using the old SF Grand Piano Home. I'm looking for a good amp that will outlast the GP Home, i.e. I don't have to change amp when i change the GP Home.

Any comments?

Thank you.