NAD makes some really good amps. i'm thinking it would be a really good match with the 990 pre.

I have a older NAD 2600A 2 ch amp.. the thing runs so cool.. it's about 150wpc, and never breaks a sweat running my 4ohm Polk Audio SDA SRS's. (each Polk speaker has 12 drivers in em.. so that takes some power to drive).

Do you already own the NAD amp? If not. why not consider a Outlaw Audio amp? Just curious is all.