I own Naim Nait 5 with a CAL Cd and I have them paired with Kef 104/2. While this is a large full range floorstander you can get the same sonic character with the smaller reference speakers from Kef. The 101, 102, C60 etc can be had at a very reasonable price used and are comparable to new speakers costing $1500-$3000. Also someone mentioned the Tukan...nice speaker available used for about $500 -$600 if you are patient. I have also demoed the Nait 5 with Dynaudio Audience 42 and 52 and these also pair well. Used examples of the 40 and 50 can be had for less than $600.
Good Luck
Jim