Sorry but the tight arse in me says "get the Distenzias" At the end of the day, the DR isn't an SRX and sticky rubber is a waste of cash. Trust me the Avons are very safe at quite accute lean angles, wet or dry (I'm usually not too far behind you on outings, with the one notable exception which wasn't tyre related).
Put it this way, over 9,000 miles the one set of avons (with life still left in the front) at 90 quid would have been replaced 3 times with the BT45's at a cost of 360 quid!!!
Your call but I know what my wallet recomends