Hi Stalkey,
Gardiner and Rodger are both well-respected naval historians of the Age of Sail. I don't think you can go far wrong with anything either of them has written. So is Same Willis. Clowes is very good; William James is a better than average source, except when it comes to the War of 1812. Battles of the British Navy" (2 volumes) by Joseph Allen is a good companion to James, as Allen
But a lot depends upon what you are looking for -
If you are interested in how sailing warships were handled at sea, what things they could do, what things they could not do, then you should take a look at "Seamanship in the Age of Sail" by John Harland.
If interest in Suffren's Coromandel Campaign, I recommend "Admiral Satan" Roderick Cavaliero. There is very little written in English on Suffren, and Cavaliero's book is very competent – a lot better than the title implies.
Before you spend a lot of money on Amazon, let me suggest a couple of no/low cost alternatives -
> Search through "archive.org". You will perhaps be surprised what turns up.
> Consider taking a membership in "Naval Review" – a quarterly publication in continuous print since 1913. Their article archive (open to members only now) has a goodly number of well done articulate essays and monographs on the Age of Sail era which member are permitted to download.
Let us know if you have particular areas of special interest; I'm sure people here can suggest a lot of more specific references (for example, how about a book on the reminiscences of Swedish officers who served in the French Navy under Comte DeGrasse in the Caribbean during the War of American Independence – seriously, there really is such a book!) :-)
B