Is the B&W 600 series a good value?

Answer to your original question: Yes.

But, you should also listen to as many of these as possible:

Totem Rainmaker
Totem Arro (narrow floor stander)

Dynaudio Excite X16

Silverline Audio SR-12

B&W 685
B&W CM1 (maybe, power hungry)

PSB Imagine B

Paradigm Titan Monitor

Triangle Titus EX

Monitor Audio Silver RX2
Monitor Audio Silver RX6 (small floor stander)

Personally, I'm not a B&W fan, although I actually prefer the 600 series to the massively overpriced 800/Matrix models. As to you central question, whether they're good values, B&Ws are almost by definition more expensive than many comparably positioned products. For one thing they're an English import, which means they're weighted down by the weak dollar; for another B&W utilizes a traditional (and heavily marketed) retail business model, which means they're subject to astronomical dealer markups. In contrast, alot of internet/direct manufacturers (Ohm, Magnepan and VMPS conme to mind)are able to deliver a lot more speaker for considerably less by cutting out the middleman.
You've gotten good recommendations above--I'd opt for Paradigm, Totem, PSB, Usher; I'd toss in Von Schweikert as well as the above mentioned Ohm and VMPS into the mix.

Loomisjohnson,

The current B&W 600 series was designed in UK and is built in China - so a good value compared to other products currently on the market assuming you like the way they sound. I think the 600's sound pretty good. The CM series is really quite an improvement over the old 700 series, with simpler but elegant cabinets, and improved drivers and crossovers. I would not say the latest B&W speakers are remarkable, but are high value and competitive with other products in their respective classes.

knownothing:
i did know that the 600s were made in china, which does keep manufacturing cost down; however they're still imported by brits, which means that their price is jacked up because of the terrible exchange rate between dollar & euro (i think the euro was up to $1.50 today)--ergo an identical product made in china for a US company will, all other things being equal, still be significantly cheaper. add in dealer markup, which i've heard can be as much as 100% on some lines, and the consumer is really getting walloped. now, i agree with you that if you like the sound, the 600s are qualitatively competitive in their price class--they (or at least the 603s, which I've heard the most) are a good, well-balanced speaker. however i still think our poster would be better served with a similarly priced ohm or totem, if only because the manufacturer can afford to put more and better stuff in them.