i'm using the kt4 which is almost exactly the same
no active cooling unless you get the kt3 ultra aru version, not sure its really needed though
thermal sensor reads the thermal diode of the xp itself, so it is very accurate
right now i'm running at 10.5x166 (locked xp1600) with fastest mem timings (samsung pc2700 2-2-5-2 1t, ultra, 4way, fast r2r)
8k3a and 8k5a also have very good reps, but i love my board and would only upgrade from it if someone handed me an asus a7n8x (nforce 2)