Dennis,
I haven't heard the BAT 300xSE which is the new integrated (priced from 4k-6k new depending on options--I would go for remote and SE pre so 5500). However, speaking to BAT, they think it is an excellent match for the S25s (what i was going to purchase) and were quite high on Dynaudio (and he was pretty brutally honest about stuff he liked/disliked). It has 150 watts of power, and apparently had no strain driving Thiel 7.2s. The BAT sound might take a bit of bite off the top end, as Dyns are truly know to be very detailed speakers (but definitely not bright). I used a Cary SLP98 as a pre for my 1.3SEs, and it worked very well I thought.
As far as the 1.8 vs the 1.3SE, it's not even close. The 1.3SE is the superior speaker. The 1.3SE is 88 into 6ohms, which isn't terribly tough on an amplifier, although 100watts is what I would pair them with.
BTW, I encourage you to scout out the new Avantgarde Solos---would be perfect for your musical tastes. Feell free to email me offline if you have other questions btw.
KeithR