Bookshelf speakers for a bedroom.

i can't comment on the harbeths, but in my own search for a near wall monitor i found that the pardigm signature s2 sounded great and was indifferent to placement. if you want to spend less, check out the rega rs1--a real sleeper.

Used Triangle Titus XS speakers for less than $400/pr used and call it a day.

I remember reading about the Triangle Titus XS a little while back. I don't know how they will match with the Quad 405-2 though??

The Triangles are fairly efficient and easy to drive, and very small and compact. Not much below 50hz or so but what is there above is top notch. They can go pretty loud with a good amp, but their most distinguishing quality is their clarity and detail at lower volumes which is as good as I have heard anywhere. They are more towards the analytic and revealing end of the scale than the "warm" one. the right ICs might tame the top end a bit if that were an issue with certain brighter sounding amps. I would use DNM Reson ICs so as to not have to worry about that if needed.

You know, the older acoustic suspension designs are excellent for such situations. I have some Boston Acoustics A170 speakers for a simple dvd/bluray system in a 12'x11' bedroom. With a very shallow depth and no ports, they're well designed to be placed with backs VERY close to (if not against) the wall. I also use them in a 6-ft near field-ish setup. They're efficient enough (~ 90dB/Watt IIRC) to run off 20-35 Watts/ch push-pull tube amps and still push out some extremely impressive bass with no sub. The acoustic suspension designs tend to rolloff in bass earlier but also less sharply than ported designs - I think this can be a very good attribute for small rooms.

Not sure what might be some higher end and/or more modern offerings with similar design, but once properly restored (re-foamed surrounds), the Boston Acoustics gear of that era is deceivingly good for the money.