Vandersteen 3A Sigs vs Klipsch Forte III

The Vandies will smoke the ADS, in my opinion. The Klipsh, again in my opinion, work best in large rooms.
That being said, getting a recent iteration of the 3a sigs would be the way to go. Unfortunately, Vandersteen doesn't keep records of when a speaker is created, so you have to go by serial number. (This is if you are buying used). 
Another strategy is to buy a pair of 1Ci's and a pair of 2wq subs used. 
The cost will be almost the same and will get you a bit more than a pair of 3a sigs in terms of sound.-And, they take up less room. The Sound Anchors on the 3's are impossible to work with in limited space.
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+1 hifiman55

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@OP, I think you can get a pair of 3a sigs for around $2k plus shipping, unless they are very recent iterations- Mr. V. constantly upgrades, so a more recent pair should command a higher price.
Though I have no experience with Tekton or Klipsch, I think you will not be disappointed by Vandersteen should buy them without audition, they simply sound 'right'.
(BTW- I owned the 3a sigs, but move up to the Treo's- a definite upgrade.
If you can spring the bucks, there is a pair of Treo CT's for sale for $5K-check out HifiShark, which I think is a super deal).
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Oh nuts, looks like the sale is off or sold.
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One of the reasons I switched to the Treo's is the Sound Anchors on the 3a sigs made them so hard to position in my crowded room. If they kept the same footprint as the speaker, instead of extending backward, things would have been less complicated.
In any case, it was a good move. The Treo's are a much advanced speaker, and they look much nicer.