Differences in sound as related to watts?

Generally, very generally, more watts means means tighter, not bigger.

I appreciate all the help. It seems that the concensus is speakers. I remember sometime ago hearing B&Ws that sounded big. Can anyone comment on that. Thank you.

In reading through the thread I don't see where there's a consensus about speakers. Although several people have asked you to explain what you mean by "big sound".

All things taken into consideration, efficient speakers are going to yield a bigger soundstage near-field without bursting your ear-drums. Inefficient speakers need space and lots of power.