I get Raynouds as well & use 'extreme cold weather mitts' (British Army issue) - inners for down to about +2, then if it gets colder or rain/sleet/snow, the outers as well which are goretex.
+1 Cant agree more with this. I get reynauds too, most rides, even in mild weather ill have white numb fingertips.
My setup uses the british army goretex outer mittens, cheap as chips on army surplus, think mine cost 7 quid.
Then for the inner mittens i bought some balls of merino wool for about a fiver and had my good old mum to knit me some mittens!
I have spent hundreds of pounds on gloves to stop the white finger over the years and these are the only ones that do it so well!
Not the easiest to turn lights on with or change gears, but well worth it for comfortable winter commutes!