Hi Ray
Using a winch to lift an anchor sounds like a great idea [It is on bigger boats with very heavy kit] but as others have said it may not be required on a 17 footer.
The one on the bow of alfresco works fine but because of limited drop the anchor rope does not stow without help so it is a two man job.
Lifting with an Alderney ring has been the way we have lifted the anchor on my last three boats [17ft, 23ft and 30ft]
with practise it is easy to do, even single handed.
Ignoring that and back to the original question.
Several choices of windlass and lots of makes are available all at 12 volts the same as your outboard battery.
If you only use them with the engine running, it will not flatten the battery too much.
But you are picking an expensive option, as you would also need to fit wiring, circuit breaker and calibrate the chain to the windlass gypsy.
If you would like to talk this through with a local supplier talk to Pete at Quay West chandlers Poole.
If you get as far as going down to see him, his chandlers is in the boatyard at Parkstone Yacht Club.
I manage the boatyard and Marina there, so if you fancy a chat over a coffee let me know. Alfresco is in the Marina so I could show you my set up if it helps.
Charlie