Not sure if you mean finest as in thinest, or finest as in best.
However, here's an old picture (On the left.) of the awl I use for the fiddly stuff, anything over a no.10 iron really. It is also my favourite kind of sewing awl (with bigger blades) up to about 6 to the inch.
It's a John James blade in a small Blanchard handle. I real like the small size, narrow ferrule, flats and bare wood of the Blanchard handles. John James blades are just pretty much standard around here.
I'd use these handles for everything, by really big blades won't fit in them.
The posh, handmade, polished, fancy wood handles look beautiful, but don't appeal to me. Unvarnished wood is more comfortable and grippy when using it all day. Also, I was taught to push a sticky needle through with the awl handle, rather that reaching for pliers or wax. Saves a lot of time but you wouldn't want to do that with a $20 handle. (Check the needle marks on these awls.)