Original Vandersteen Model 3

Since you can buy a pair of 3a sigs for about $2k, I think that would be the least expensive route. Though Richard constantly upgrades the upgrade, it may be worthwhile.
I would contact him directly for the most accurate info. And, yes, he does reply to questions left on the telephone directly.
Bob

I think Vandersteen offers upgrades for the 3's, but it isn't cheap.
For the price, I don't think you will be disappointed, but if you think you will be looking for 'the best', I would suggest either waiting for the 3a sigs or better yet, a pair of Treo's or Quatro's.
True, they are more expensive, but I though I was never going to have 'upgraditis', and ended up selling my 3a sigs and getting Treo's. I should have listened to Mr V. and just gotten a pair of Quatro's and been done with it.
Incorporating a sub (or a pair) is one of the best upgrades for the 1,2, or 3's.
Bob

Abnerjack, are you still here?

Abner, I think for the money, you will be impressed even though they are prior generations. I always loved Maggies as well as Vandy's- they seem to share similar characteristics. 
Even if you don't like them, you can always sell them again and probably for the same price.
Though I warn you Vandersteen's are addictive and you may well be on the road for a pair of Quatro's.
Bob

Obviously true, but your original post was wondering if the 3's would be a good speaker for $400. And the answer was 'yes'.

If you want better, then it will cost you.
Your 1.7's are pretty new, so if you want to compare apples to apples, then getting a current Vandy is the way to go.
If you just want something different to play around with for a few hundred bucks, then a pair of 3's would do the trick.
b