You will like the Stratos for sure! Be it the Stereo, Stereo Extremes, Mono, Dual mono, or Mono Extremes. My hunch is that you will finally hear how good your speaker are. For what it's worth, My monos bested the Threshold Stasis amp (250/ch A/AB Optical bias designed Nelson Pass) in my set up easily. More spare power you're concerned? Might be better in the long run if you really think about it. Besides, if you only use the Class A portion (Stratos are biased A/AB also) then you will experience first hand how good class A really is in terms of musicality.
The problem? Like what Sherod says, you will be on the upgrade path in no time. So, not counting whatever amp from the Stratos line you'll get, be ready for some serious audio money my friend.
Talk to Klaus (fine fella btw) and maybe he can answer your concerns. In any case, the amps have 20 year warranty so your investment is safe. Assuming that you will sell the amps for whatever reason (I highly doubt it though), have you noticed that sometimes their resale value is about 70-80 percent of the original price? That should tell you how good an investment Odyssey products are!
BTW, be careful about some posters here. There is a guy who will take all the chance he can get to downgrade the Stratos amps where in fact his is an Odyssey clone to begin with. Do your research and there's no way you will miss who I am talking about!
Good luck and hope you can make your decision wisely.....