Wilson Watt Puppy, which version?


I am thinking of getting into the WIlson line with the Watt Puppy's. I have heard a few before in showrooms and I enjoyed them. I can not afford a new one, so looking at the previous ones there were several versions produced over the years. Can anyone explain the differences and if there are any "sweet spots" in the line up. ie is every newer version better or was there a point of diminishing return with the introduction of newer versions? I am trying to stay under 10k for a used pair. Thank you
vdosc
Samhar, Average SPL listening levels range from mids 80's to below 70db C weighted. Occasionally get louder but even if the system and ROOM can handle it, I can't. I am a live sound engineer so I get enough high SPL at work ;) Thats one thing I have liked about my Martin Logans is they sound very good and image really well at low SPL I tried some Vandersteen 3Asigs but them seemed to need be driven to reall sound full (in my room with my gear) and then it was too loud. So thats why I am thinking its time to make the next big jump to Wilson's
First I had 3A Sigs, then added a pair of 2Wq's before the Sophia 1's!!! Funny!!
I was in the mid 65's, sometimes even in low 60's!!! Usually in the mid 70's during the day.
At the time I likened the change to putting on a pair of distance glasses and realizing what I hadn't been seeing!!! So yes!!!
 Since this is an old post let's hope this message gets to you, Vdosc!  I am in the same position as you were, I own an audio research VT100 Mark 2,  and I am looking at Wilson speakers. The watt puppy 7 and the Sophia 2  are both on my shopping list.  May I ask, did you end up purchasing a pair of Wilson's?   Which ones did you go with? Were you able to addition any of the speakers with your VT100 amplifier ?  From a research standpoint,  The Watt Puppy 7 seems like a great way to go, if the VT100 can handle it.  Looking forward to hearing your thoughts.