Most of the better companies out there will be able to help you with all your needs and the right advice!
I personally would put an xp on single motor 8274!
125 foot of 11mm Marlow rope
Gwyn lewis or west mids 4x4 twin alternator bracket with a Disco alternator.
Ebay for waffles, cheapest place.
Quick strops, shackles, winch sails, strops also available from all good suppliers.
Dan