Hi Peter
I use 2 powered JBL Eon 10G2's. They sound real good. Almost always I am able to tilt the speakers back, let the sound bounce off the ceiling and not have to use stands. They weigh only 23 lbs.
Some time ago I checked out the Peavey PR10's and PR12's. I don't remember if the PR10's I tried were powered or not. But I can tell you they did not sound as full or have as much umph as my JBL's which I took with me to the store for a side by side comparison.
At the time I was experimenting to see if the PR12's would give me more power and depth of sound. These were not powered, which is what I was interested in because they only weigh 29 lbs.
What I found was there was an enormous amount of power available through these speakers. It also seemed to add some nice depth in sound, which is what I expected seeing as the speaker itself is bigger and the cabinet is bigger and deeper.
I did notice some drop out on some notes of some instruments. In discussing this on SZ it was mentioned that I was using the classic "V" shape for the EQ controls. This may explain why the instruments I noticed the sound drop off on were experiencing that.
I only had a short time to try these speakers out, mainly because they were so loud to the employees in a very large store.
I am thinking one day soon I will try them again, and I suspect if I set the EQ to flat that they will be fine.
I was considering getting the new Behringer PSX880S (I think it is) lots of power and only 19 lbs and only around $350.
If this set up works as well as I think it will it will allow one to have a very light weight system and also very reasonalbly priced. The entire set up can be bought for between $600 - $700 with a little snooping around.
I own the Logitech z5500. Some of the players like the Logitechs. For my taste there is a major lack of mid range.
I do sometimes use the Logitech sub with the JBL. This is a quite a sound . I prefer not to use the satelites.
As far as enough power for larger rooms using the JBL 10's. It depends on how big a room you are talking about and what kind of music. To me, they cover about 98% of the rooms I play. And yet, most think I am always too loud, including in the few large rooms I would have liked more.
If you were to get the JBL's, IMHO you will not want to or need to use the Logitech z5500.
Since you have mentioned Peavey, I would suggest testing out the PR12's.
The main thing is to try them yourself and see how they fit your needs.
Best
Scott Langholff
http://ScottLMusic.com