Re: Recommendation for a newbie
I think you'll have a bit of a challenge ahead of you in terms of finding a whisky that combines ex-Sherry and ex-Rum cask characteristics... certainly one in which the Sherry casks were rather more 'active' (i.e. first-fill) ones.
You're much more likely to come across whiskies that have been aged in ex-Bourbon oak as well as in ex-Rum casks (usually finished in the latter). One such whisky I've enjoyed is Benriach's Arumaticus Fumosus 12 Year Old. It's pretty tasty.