Best Match for Dynaudio Contour S3.4?

MC, I know your feeling on mods (haha)... but... this amp was just upgraded by John Soderberg, who is a known guy (worked at Threshold for like 15 years and now does upgrades to Threshold amps). So it got a full overhaul - the full "go nuts" treatment - for $1200 less than two years ago. And it will cost me $500 less than an X150.5 - if I can even find one! And it is Class A (not A/B)

But it weighs 100 lbs and needs its own stand (which the seller will throw in at no cost). And I can pick it up semi-locally. And the guy said he'd take it back in a month if I didn't love it... So I am considering it for all of these reasons.

But I feel like I should just shut up already and make a decision. It's just that I am VERY bummed out that the ARC 100.2 did not do the trick for me. That really pisses me off because I thought I was done finally. So I don't want to go through another round of this...

Well Grant, for $2500 shipped I can be the proud owner of an ARC SD135 which is only two years old, and apparently kicks the pants off the 100.2. Or for the same money, I can wait for another X150.5 to come up. Also, Dan from Reno Hifi told me there is very little sonic difference (based on the listening experiences of his customers and himself apparently) between the X150.5 and the X250 (older model 250). It is fairly easy to pick up a used X250, so I wondered what your (or anyone who doesn't have a used X250 to sell me's) thoughts on this might be.

As usual Grant, you make very good points... Now if you could just find me a used X150.5 I could shut up already and give my fingers (and brain) a rest!