There is a new power amp out by Crown - the XLS with their "DriveCore" technology - Class D, 440 watts per channel into 8 ohms, and 10lbs. Venture to say though, nobody's tried it yet...since it's pretty new. One thing I'm concerned about is the potential fan noise...forced air...anyone happen to have seen it or tried it?
http://www.crownaudio.com/amp_htm/xls_drivecore.htm
...otherwise...many people here using the Art SLA-1 and SLA-2. Also some Carvin users as well.
Are you just trying out one of each, then going to return one for the other of same? Or will you "mix and match"