Upgrade from Vandy 2w to 2wq.

In one word: yes. I have owned both the 2W and the 2Wq, and the 2Wq is a meaningful improvement over the earlier version. I currently own a pair of 2Wq's and confidently recommend them to serious music listeners (but not for LFE in home theater). The Vandy 2Wq is one of the true unsung bargains in high end audio. If you decide to buy the 2Wq's, spend the extra money to buy the Model 5 crossovers, which are much better than the stock X-overs.

Thanks sdcampbell,
I already own the 2w's, but was considering the 2wq. that was for sale on Agon. It sold, but I am now considering upgrading to the Vandy 5's, instead.

The 2WQs will add the lows you may be seeking and the removal of the load on your amp will likely improve your high range.  That may actually be the best part!  I keep the "Q" level almost down to zero.  The higher you set it, the more boomy bass you get.  You can increase the sub volume separately from the Q level.  Get two (2) 2WQs!

Vandy 5 is a whole other animal.....I have a 5A.....wonderful.

Thanks jokerman, I really don't want any more bass, just more accurate.

Stringreen, I am looking at a pair of 5a's for sale. The seller is very accomodating (will meet me near my location). My only problem is whether they will fit in the space I have.
 I have 3a sigs currently and like the sound, but would think the 5a's would give me more flexiblity with placement, as well as give me more detail in sound. What do you think?

(((I have 3a sigs currently and like the sound, but would think the 5a's would give me more flexibility with placement, as well as give me more detail in sound. What do you think?)))

A full range speaker is a concern by possibly overloading the room with bass at the rooms resonance frequency points, which can vary from one room to another.
 That said most folks are not aware of where it happens or what frequency. Below is a task you may wish to try and share your results. Plus or minus 2 or 3 db in the lab is different then
 plus of minus 3 db in the home.
 If you have an SPL meter set to slow/ C weighted and download Vandertones from Vandersteen Audio
http://vandersteen.com/resources/document-downloads
 play track 1 thru 11 for your left channel , and tracks 16 to 26 for right ch write down the results on a pad vertically, try and get 8 of the 11 tones above 70 DB with this you can plot your left and right side of the room and see what the room looks like and share your results.

 Best JohnnyR. 
PS 
 Trk 13 and 14 are great acoustic bass tracks that allow us to easily hear your rooms resonance areas.

Thanks for the reply Johnny.  Yet another task to perform...
But, it does make sense, and I will do it when I can get some free time- Yes, I am a Gardener, so summer is when I make my 'bread and butter'.
Is a Radio Shack Soundmeter okay, or should I get something else?

Radio Shack Analog Sound meter is fine
 I forgot to mention adjusting your pre amps volume control when trying to get 8 above 70 db and 3 below with the above meter settings on  slow and C weighted.