Lots of detail, great imaging, not much bass?

Wait.

Let get this straight --

You DO NOT want a lot of bass.

You DO want detail and imaging.

With a budget of $700 for used, I would recommend you listen to some smaller Proacs, maybe some of the Tablettes and if you can find a 1SC (great speaker) near your price level.

Hi B_limo,
As Milpai implied, you'll first have to work to getting good gain from your system
(generally, avoid passives) - this will enable your system to open up/come to live
better with just minimal volume.

Then, look for well balanced speakers/monitors that will play nice and full at lower
levels - usually good efficiency ones.

Hence this way, you can do away from disturbing neighbors without sacrificing much
from enjoying full range sound.

From original post (as perceived from your request), you'll likely be getting many
recommendations of speakers with tendency to be tilted upwards having limited bass
~ you might want to avoid this. Good luck!

I think a perfect pair would be a used set of Silverline Preludes. Superb bass but won't bother your neighbors as it is tight but not ultra deep, excellent imaging and beautiful with female vocals, and can be found in your price range.

"With a budget of $700 for used, I would recommend you listen to some smaller Proacs, maybe some of the Tablettes and if you can find a 1SC (great speaker) near your price level."

That would have been my first choice but I think it will be hard to come by used and within budget.

There are a pair of Paradigm Studio 20s active version (built-in amps) that would be *perfect* for your needs. All you need is a preamp or universal player with volume control to drive them, Seller is asing a very reasonable $800 for the pair...

http://app.audiogon.com/listings/monitors-paradigm-reference-active-20-black-finish-2013-05-04-speakers-75087-heath-tx

-RW-