Unless you're a hipster or a time traveler from the prohibition era, who cares about gin.
As for your last part.
Gimlet - 4 parts gin 1 part lime (hard to do in ounces since you never want more than a half ounce of lime unless someone requests it heavy)
Yellow Rose of Texas - 4 parts tequila 1 part yellow chartruese (sp?) 4 parts pinapple juice fill with club sode
Aviation - Gin, grenadine, lemon and something I'm forgetting
I'm assuming by New Standard Manhattan you're going with the Rye, bitters, and sweet vermouth. Though I'm not 100% where you're going since there are many different kinds of Manhattans. Personally if I have to pretend to be trendy and drink a mixed drink like that I'd go with a Rob Roy since Scotch is superior to Rye. And Though if I had my way I'd rather have that scotch neat with maybe a few drops of cold water.
I'm not saying I don't own lesser boozes but I don't spend serious money on them. Why would I spend 25 bucks on Jack Daniels or Jim Beam when I'd only shoot it, mix it, or chase it and instead I can get something ****ty for 15 and walk out with 4/6 of aweome beer that I can start the night off with before switching to inferior liquors.
As a smart fellow, I'm sure you know the basic history of the cocktail lets you know that the rise of many of the drinks you listed coincided with prohibition, where you had a switch from whiskey to gin (faster aging) and the reason they added so many ingredients is because the liquor sucks. Now that we live in a world where we don't have to consume inferior booze, I see no reason why I shouldn't just enjoy my quality scotches and bourbons, and what nots.