I am building a boat which I will need to outfit with all of the deck
hardware soon. It's a 48' catamaran. I am very unfamiliar with all of the
hardware vendors and their endless selection! Any favorites out there for
Winches, Blocks, and Mainsheet Travelers????

Also, are there any large negatives from the following:

Buying good used winches?
Ending up with different manufactures of winches ( I need five on my boat
ranging from a 16ST, 30ST, 40ST, 50ST and a 52).
Can a used non self-tailing winch be fitting with something aftermarket for
Self Tailing? Do they work?

Any good resources (similar to consumer reports) for recommendations on
hardware?

Thanks,

Steve in Houston