Quintets are IMO some of the best micro satellites around but I would listen to them first. My experience comes from Klipsch's Promedia 5.1 computer speaker system. The Promedia used the Quintets for its satellites and I had one connected to my PC for probably 3 years and really enjoyed them. But I did find them a bit fatiguing after extended listening. I also used a another pair for living room surrounds. Note that that the 4 satellites are so small that they will need to crossover to the sub at no lower than 120hz and the center should probably crossover at 150hz.
Two alternatives that I would consider are
Boston Acoustics CS26 bookshelf speakers. Another member found them on sale at BA's website for $75 each shipped (1/2 price). For the $250 that the Quintets would cost you you could pick up three of the CS26 and use them for L, R, & C, and keep using your existing HTIB surrounds for now.
The second alternative is two (or three) pair of Behringer B2030P. These usually sell for $130/pr but someone discovered that B&H Photo had them for $67. The are currently out of stock and I'd be shocked if it wasn't a price mistake but you could see if they get some more next week. I'm using these along with a old receiver and subwoofer as replacements for my old Klipsch Promedia 5.1 system and like them a lot more. Totally non-fatiguing. Unlike the rear ported BAs these can be wall hung. Shockingly good speakers for the price but I wouldn't use them in a large room.
All three will fill a small to medium sized room with plenty of volume. The Klipsch will need to crossover to the sub at 120hz+, the Behringers at 80hz, and the BA perhaps as low as 60hz as long as you leave some clearance behind and around it for the port to work.
