From the reviews that I have read, the Krells have the typical Krell bass, which is aplenty. However, the measurements are not that impressive (see the Stereophile review - John Atkinson mentioned something about the amp sounding defective, and there is one by Doug Schneider as well).
Also, someone mentioned Musical Fidelity. I've read one review which said the amp was not as fast as some others (notably Simaudio) and there is also negative connotations about it being made in China. Let's just say that the one I demoed with Dynaudio S3.4 was plenty fast and lots of power. I think the MF is a very good amp for the money and well spec'ed as well.
I've also listened to the McIntosh integrated (using Thiel speakers). They sounded pretty good as well. I did not do a side by side so can't really say which was better.
I have not listened to the Krell.
I have listened to Simaudio extensively (with Opera, Canton, Reference 3A, Dynaudio and Focus Audio speakers), and can say this is the amp that leads it class. On a value basis, the price increase recently makes Sim not really as good value for money. However, if you can find a good demo unit or used, then this is the amp I would get - Simaudio i5.3.
You can also try Bladelius - a little know scandanvian company that produces some nice sounding amps. I listened to these using Focal 1027be, and the bass was quite nice compared to other amps like NAD, Accuphase, Onkyo, which made the 1027bes sound really lean. But Bladelius might be more expensive than what you want to spend.