I'm not sure on the Quads--there are probably others here who know more about them. (I know they are electrostatic, of course, but haven't heard them, nor do I know of anyone who's had any experience with them.) I don't think they are as robust, and they likely would need a sub to fill out the bottom octave. Acoustat is another older manufacturer of stats. They can both sound really good, but I'm not sure if they are like a type of girlfriend (beautiful, but high maintenance

).
I'm more familiar with the Martin Logan line, plus a newer manufacturer Soltanus Acoustics. There is a company named Sanders that also sells stats, but they are on the high end of the scale.
My only concern is that the older style of manufacturing for Martin Logan's electrostatic panels will only give about a 15-20 year life. They tend to weaken, due to the conductive coating degrading over time. They can be replaced, and there used to be someone out there who could rebuild them at a far less expensive price. The newer panels reportedly (according to a factory rep) have an unlimited lifetime. I'd probably stick to about 10 years old tops, and even then, $2k might get one of the less expensive models, or their entry-level Electromotion ESL (which again, I have not heard). As for the older models, unless the panels have been replaced in the last few years, I wouldn't pay the going price for any of them.
There are also Magnepan speakers (a magnetic planar type of speaker) which many are fond of, as well as ribbons like the Carver Amazing Loudspeaker (which also uses an array of woofers). Magnepan even used to have a trial program on their entry-level model, which was pretty cool. A good way to try them in your home to see if you liked that type of sound.
Panels are an acquired taste, though. It depends if you can live with their shortcomings (room placement can be fussy, and flat panels have a narrow listening "window" where you need to remain seated at one spot to hear them at their best, where curved panels have a bit more leeway). It's best to listen to a pair before dropping that much coin on them.
Are those Vandersteens looking better now?