Making a difficult decision

I used to have a Nova150.  I loved the connectivity options and even the look (ebony wood finish) but after a year the sound was simply too dry and 2 dimensional for me.  Completely a sonic preference to me, particularly as I listen mainly to jazz, acoustic, vocals, and folk/roots. I ended up going down the tube path instead which has been much more rewarding for me.  I think the Nova150 was at its best when listening to rock.  It can drive a pretty wide range of speakers fairly well.  I have not heard the Parasound.

Yes big Greg I have listened to both with mag1.7 but the room was just a showroom type setup. They sound fine but not the best way to listen. I did hear a peachtree nova 150 on paradigm 75f speakers and was blown away! 

to me, most integrades are not nearly as good as seperates

With those speakers Parasound would be my only choice. I have the A21 and it is a beast, sounds clean and powerful.

@audiomaze, wrong comparison, nova150 working well for Paradigm is not the same as working well with your speaker. Paradigms are 92 dB / 89 dB and are stable at 8 ohm (if I remember right) very easy to drive and they have been like this for sometime. They driver based speakers. I have a pair of Paradigms studio 40 v3 version very easy to drive.

Do you know the lowest impedance level your speaker will go to?.

Check out Sanders amps , top notch and built for electrostatics : 
http://sanderssoundsystems.com/products/amplifiers/esl-mark-ii-amplifier
http://sanderssoundsystems.com/products/amplifiers/esl-mark-ii-amplifier

Try used market for such amp. You may be able to get something and have spare budget for an excellent tube preamp.