In need of amp upgrade suggestions


Interested in upgrading from our Simaudio Moon W-5/P-5 amp/pre power plant of 9 yrs.  Have always enjoyed the authority of the W-5, and would like to find something that really excels in low amplitude transient clarity, frequency balance, and can throw an exceptional soundstage.  Digital source is pretty hi-rez (Esoteric K-03), and cabling is on par as well (all JPS Aluminata).  Speakers are strong in efficiency (Daedalus Athena) at around 95db.  Recently auditioned a pr of Pass xa60.8's, but frankly thought the W-5 did a better presentation, less soundstage (I know, sounds crazy, but that's the way I hear it).  Open to push/pull, SET, or ss, but I suspect ss.  Any suggestions?   

mbump
Since you have Daedalus speakers, surprised you haven’t looked at Modwright?  Lou is a big advocate of MW amps  driving his speakers, and MW gear is very well designed and supported. 
Though I have not auditioned in my system, I have listened to two different systems w/ Dan's KWA 100 and 150SE (one w/ Daedalus Ulysses, one w/ Magico's).  Just not the resolution I'm looking for - seemed a bit rolled off on upper frequencies and soft in midbass.  But just my impressions.  Both Dan and Lou are top-shelf individuals, and I trust their work and professional opinions implicitly.  I had considered two particular SET designs - Art Audio Adagios and the NAT se2se monos.  However, concerned w/ the former's current lack of support in the US, and sim. with NAT, just not much information, though what I have been able to gather via internet and colleagues has been descriptive of the sound I'm looking for.      

The NAT SETs have excellent word of mouth reputation for sound and rugged built quality and should work well with your speakers. I'd look at an 845 SET such as Line Magnetic 219 and the Coincident Turbo. Both have very reasonable pricing with very good reputations for sound quality.
Curious why you have no comment on my recommendation.

Are you unfamiliar with eXemplar Audio?
fliz - Thanks very much for your recommendation.  I'm not familiar with eXemplar Audio, but am now looking into and doing online research.