I've listened to the 60's at my local Magnolia Hi-Fi several times and in that price range ($650) I like them compared to the Energy, Athena, Polk, and Bose systems. The build construction is superior to Bose stuff. I have not listened to the speakers Gregz mentioned.
As for the 100's, my friend has them connected to an older Yamaha that is about 6 years old with 100 watts/ch, I do not know the model number. Anyway, I have always been impressed with the sound. He upgraded the sub to a larger Def Tech about two years ago and it made a noticeable difference. I believe the 100's are at least twice as much as the 60's, probably right in your budget
Oh, and the 100's are pretty cool looking as well. They come with mounting plates and have an angeled top (or bottom). One of the cleaner looking sat systems out there IMO.
Give them a listen and report back.