Are they going to be placed in a bookshelf? What typical volume will be used? Background music primarily, or do you jam while working? What are you going to listen to?
You've got some good choices available, but I'll share what I am using in my office: a pair of Krix Equinoxes that I bought for $300 (used) on Audiogon. I think they're an excellent small speaker which meet your criteria for a true bookshelf unit. Some other choices might include the PSB Mini's, the Dahlias (Dick Olsher of Stereophile mag fame designed these), etc.
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