Wishfish:
They cost more than Par-Metal, but HiFi2000's enclosures are beautiful and very functional. I've purchased their Slimline and Galaxy Maggioratto enclosures and have been very, very satisfied. For a Krell KSA-50, you'd want to consider one of the larger Pesante Dissipante boxes. Check out their website (http://www.hifi2000.it/default.asp?Langid=1) or their sales arm (http://www.modushop.biz/).
HiFi2000's prices are very reasonable, but shipping can hurt. My last purchase from them included 7 boxes, so I was able to gain some volume efficiencies.
By the way, I'd strongly recommend getting the 10mm front panels.
Regards,
Scott
p.s.: Here is a photo of my latest preamp, built in a Slimline chassis (the power supply is in a separate Galaxy Maggioratto box). I designed the front panel using software downloaded from Front Panel Express and had them drill, engrave and color the HiFi2000 front and rear panels.
