ajf said:
Designing Great Beers is a wonderful book. Brewing Classic Styles is also great (but totally different to DGB) It gives you recipes for each of the major styles which can be used as a sanity check for your own recipes, or a starting point when you have never made that style before.
I agree with both these books, and supplement the BCS with the info gleaned from different episodes of the Jamil Show podcast on the Brewing Network. The early days of the show was Jamil and John Plise (and others) talking about each style, and then giving his/their recipes for that style (usually Jamils recipe from BCS). Then the show morphed into "Can you Brew it?", where they'd (along with Tasty McDole) try to clone a particular commercial beer, and taste them side by side, talk about recipe and style, etc. Now the show has become "Brewing with Style", where they get together a few commercial examples of each style, along with a listener-submitted homebrew sometimes, and talk about which best exemplifies the style and why, along with more style and recipe info.
For example, I'm working on an American Pale Ale recipe (I'm also new at the recipe formulations, and don't have the years of experience or knowledge yet to just "know" what should go into which style off the top of my head... So research, read, and play around with recipe software!). I read DGB, and saw what kind of ingredients Ray talked about and what went into the beers he surveyed for the style. I then read BCS and compared that to what Jamil used and recommended. I also would compare everything to the BJCP guidelines along the way (not that you have to brew "to style", but since I'm new, I follow the old adage that you have to learn the rules before you can break them). I have since been listening to the old episodes of the Jamil show - the original one about APA (along with the IPA, IIPA, and English PA ones for comparison/contrast), then the Sierra Nevada PA and Mirror Pond "Can you brew it?" episodes, then the newer "Brewing with style" APA episode. Those guys have tons of experience to pass on, and do it in an entertaining way, so I enjoy listening to the podcasts while commuting, working out, mowing the lawn, etc. And I did use this site to scour through all of your recipes for comparisons, as well...
In the end (which I haven't reached yet for my APA - still tweaking), you/I will just have to settle for what you think will be close to what you expect it to taste like based on the similar examples you've had or read about, and based on what you think your ingredient changes will do to it. Then brew it, sample it, and adjust the results if necessary next time! Cheers...