There are also smaller M-Audio AV32 monitors with 3" drivers and the cabinet drops from 7.4" to 6.1". The key with studio monitors is to angle them directly at your ears, so having them wide apart is not an issue at all. Ideally, it's an equilateral triangle made by your head and the two speakers, but I have my speakers about 6' apart to avoid putting them right up against a back wall and it works just as well, IMO.
Mackie are the other well-known brand that actually bother to shrink the cabinet size for their smaller drivers - look at the Mackie CR3, 6.2" deep.
This site is scathingly critical, also hillarious; He takes pleasure in applying audiophile testing to entry-level consumer speakers. His reviews of the AV32 and Mackie CR3 favour the AV32 and says they sound better than the equivalent 2.1's from Logitech etc:
http://noaudiophile.com/M-Audio_AV32/http://noaudiophile.com/Mackie_CR3/http://noaudiophile.com/Logitech_z623/ (the 2.1 set he's referring to in comparisons, arguably inferior to the Klipsch)
Although a few Hz higher on the low-frequency response numbers doesn't sound like much, the difference between a 3" and a 4" driver is enough to notice. Some of the lower instrumental stuff dips into ranges that you really want a 5" driver for. A 4" driver is compromised slightly, and one of the reasons why I like the Presonus Eris E4.5 so much, but these 4" and 4.5" speakers are fairly chunky when you're used to compact satellites of a 2.1 setup.
The thing is, the Klipsch satellites also have 3" drivers and whilst their cabinets are too small to provide a linear frequency response, they can at least handle the 100Hz-350Hz band that many smaller 2.1 sets struggle with. They are reasonably well-made, they sound okay even by audiophile standards, they're plenty loud enough and they're good value, You could do a lot worse than pick up the Klipsches!
Is there somewhere local you can hear some 3" studio monitors? That would likely answer your questions better than any internet forum, especially since everyone's ears are different. My gut says that you'd probably appreciate a set of AV32s over the Klipsch, but at the same time if you love your bass it would be the wrong call.