Thanks for the advice; thing is I rather like what the HK does, or rather, is reputed to do; there 90s amps (HK1400, 6550, etc) were all powerful rocky amps, so I'd like to run the rule over the 990 as well.
The Exposure kit has the kind of character I like too, by all accounts, so that's a nap. Rotel, hmmm, I wouldn't be writing their gear off at all...some of their pre/power stuff looks very appealing and likewise the current 1520 amp.
I tend not to discount a brand's on the basis that "X won't work with Y" and tend to go more with the blend between the components - the overall synergy. If that clicks, then I'll run with whatever's there irrespective of the badge on the tin.