Small balanced monoblocks

I've used a pair of Pass Aleph 3's (obtainable for around $1000 each, with patience) very successfully as monoblocks, paralleling both input and output, as per Nelson Pass's recommendation. My only knock on these amps is that they take an hour or so to reach their top performance. But their top is pretty high, if you like solid state at all, IMHO. I think you could do a lot worse.

You should add the Bryston 7B-ST monoblocks to your short list. They are of reasonable size, offer a combination of excellent power and sound quality (rated "Class A" by Stereophile mag), and have a 20-year transferrable warranty backed by probably the best service in the high-end industry. A new pair sells for $5000, and can often be bought used for around $3000-3500.

With your BAT preamp, consider BAT VK60's mono. Used for around 5k. Not exactly small...but great match with the wadia, 3i and speakers...

Have you considered the BAT VK-500? It's a single unit with two monoblocks in the enclosure. Two power cords, two power switches...

I would add Clayton M100 monoblocks to your audition list. Output is rated at 100 watts / ch. class-A. It has both RCA and XLR inputs, and its relatively small size would fit your living room as well. Check out www.claytonaudio.com for more info.

Happy Listening!