Help Choosing Speakers

All the Vandy 2 series are a HUGE step up from the 1 series. Even considering your demo results, spare power would be beneficial; you might not notice it unless playing dynamic challenging music, but in the long you will appreciate having spare power & headroom from clipping. 

My advice is to call John Rutan at Audio Connection, who is probably the #1 Vandy dealer. Ask him about getting a trade in 2 Series, as he likely has a steady stream of upgraders seeking Treo, 5 & 7 series etc.

If you are open to others than Dec amps consider used McCormack for SS or go with something from Rogue for tubes. Both are frequently paired successfully with Vandys.

2s will keep you happy for a long time and you can upgrade your other gear around them without them being the weakness for some time. I did.
The 1s will leave you wanting more & soon. Cheers,
Spencer  

I agree with sbank on all counts.  I think if you read the "Ask Richard" section on the Vandy website, you will see that Richard frequently recommends the 1 for folks with lower power tube amps, and tends to encourage more juice for the 2 and *way* more juice for 3.  The only answer is a demo, though.  At the very least, bring your amp to the dealer and listen at your normal levels.  

As a Vandy owner, I think if you are considering the Vandy 1's or 2's, you should get at least one or better yet, a pair of 2w subs. Since the Vandy sub crossover (M5-HP) will filter out low frequencies, you probably wouldn't have to get a more powerful amp.
Sbanks recommendation for Johnny Rutan is a sound one. He will give you lots of great information you can trust.
I also +1, the recommendation for McCormack amps. I own the DNA-1 and MicroPower Drive.
I am currently moving to Atma-Sphere amps and preamp. I haven't got things hooked up yet, but when I do, I'll let you know what I think, if you wish.

  You probably don't need another option, but I just demoed the ProAc Studio 148 (at SoundImageATL--thanks Lawson!) and can't keep silent.  They have excellent detail, but no harshness, amazing vocals, as well as surprising bass for the size--but most of all they just get out of the way of music & let you feel the emotion of the recording. Recommended for amps 15 watts & up (4ohm), but you certainly wouldn't need a sub (except for organ music).

  I much prefer them to my experience of the Vandy 1's, but admit it isn't the fairest of comparisons as they're almost 3x more expensive & I was in a dedicated room, listening to my music from a Linn Majik 'integrated' thats more expensive than the speakers.

Vandersteen speakers have always had a synergy with McCormack gear.  I am listening through Vandy Treo Cts powered by an SMc Audio modified McCormack DNA-1 amp as I type this.