The Def Tech Pro 100s will give decent performance in a smaller room but in an 18x20 they will be inadequate. Speaker that size may be acceptable for movie viewing if you have so so expectations but try some budget small bookshelf speakers from B&W, KEF, Monitor, Jamo, NHT, PSB, etc. doe 350/pr + a $250-300 center channel plus cheaper surrounds and you will experience a sectacular improvement over any sub/sat system. With some tough negotiating you could pull it off for 1K. All of these sub/sat systems are limited in their ability to move air and you will notice it especially listening to music. Bang for the buck, go with the Jamo's and you could include a sub for under a grand.

Def Tech are really nice on the upper end (Use to have an array of them with Adcom power). Had to sell them when I took a professional hiatus. I haven't tried the more price conscious items.

After getting married into a family a while back, I had to be much more price conscious. Put together a unique combination of Warfedale (Emerald fronts, bipolar surrounds) with an Infintiy 3 way center and an AR Sunfire sub that makes most smile that hear it (powered by a Denon). My wife's boss spent lottabucks on his system (speakers are Polk, Niles and Velodyne sub) and he asks me for what treatments I performed to have my system perform the way it does (none are performed as of yet). Plays movies, my daughter's hiphop , my wife's George Winston and my Gary Moore all well.

Best I can suggest is 1. pick your budget, 2. listen, listen, listen, 3. spend time positioning according to taste.

The mfg suggestions you have seen so far in replies is dead on.

PS: Best I have heard are Martin Logan, but god you need a lot of power for those. Tried some in house about 10 years ago (the Defs were 2 years old then) and my Adcoms putting out 250 per channel wasn't enought to drive them to 90db in a 15X20 room. Heard them with some Levinson's and Oh WOW.

My thanks to all of you for your advice. I did finally get to audition the DefTech Pro 100's and Pro 80's at home and I must agree with member SHOE that I was underwhelmed with their performance in my 18'x20' room. In fact, I found my current mismatched setup to be far superior for music, and somewhat better for surround movies and dvd's. The one improvement I heard that was significant was in the center speaker in which the Pro 100 was far superior to my existing Polk. Once again, my current system is composed of Polk RM series 2 for surround, center and sub; and two old but wonderful full-size bookshelf speakers, ADS L 1's for right and left. My current feeling is to seriously upgrade my center speaker and continue with the current set-up. I do have an extra pair of small bookshelf Infinity "Sterling," and I will try out Shoe's suggestion as to satellite vs. bookshelves. Thanks Shoe. As before, all comments appreciated.

Substituting the Infinitys for the Polks provided a dramatic upgrade. Nowfor a better center, and I'm set.