Monitor recommendations with sensitivity =90

Depends on how much you want to budget for a bedroom system, but I would highly recommend the Reference 3A de Capo's. They have a 92 db sensitivity and sound awfully good. I currently use their Royal Masters, which are the same drivers put in a higher level cabinet - - they sound quite nice driven by a 24W integrated (EAR V20). You can't crank The Who to concert levels, but you will get beautiful music (and that can pretty handy in your chosen locale).

Their bass driver without need of crossover is truly fine. Good luck!

Try out the Cabasse range of spks. They have some very sexy looking and good sounding monitors. Should fit most contemporary decors with a high WAF factor.

I have heard good things about Omega Loudspeakers.

I have heard the Reference 3A's and thought they were special.

Another option that comes to mind is a Voigt Pipe such as TWL uses. The Cain & Cain Abby is a comericially available product.

There are other DIY options as well. The Zigmahornet is one particulary interesting DIY project.

Here is another DIY loudspeaker built by Jerry Seigel. I am not aware of the efficiency of this design.

The Paradigm Studio 20 V.3

klipsch reference series with the RB-5 looking like the best of the medium sized moniters. These can be had for less than 600 inc shipping in USA 48 states with warranty. Very efficient at 96db and 8 ohms, rated to 48hz.