I've heard all of these integrated amps, and it's true that each has somewhat different sonic signatures. If I were going to buy an integrated amp today -- at least one with a "reasonable" pricetag (by high-end standards) -- I'd buy the new Bryston B100-SST. It has more power than the older B60, better circuitry, and is (IMO) more neutral. Not to mention the great 20-year, unconditional, transferrable warranty!
For more info about the new B100-SST, go to this link:
http://www.bryston.ca/b100sst_m.html
For more info about the new B100-SST, go to this link:
http://www.bryston.ca/b100sst_m.html