Oh man ... you've caught the bug. One guy mentioned that you are a pointer guy and based on your many posts on this board, I am going to assume that you know your pointers. Picking a setter, in my opinion, will be easier than picking a pointer, mainly because there are not as many folks raising setters as there are pointers. I think, because of pure numbers it's easier to filter through the good and the bad or the what you want/don't want. So that's good. Now to answer your questions.
I shave my dogs in late April or early May and shave them about once every 3 weeks after that to keep them cool on our summer runs. I then shave them one last time at the beginning of September. Their coats will be short for warm days in September, but will be long enough to handle the cooler (or downright cold days) on our October Montana trips.
It's hard to say what the "bigger running lines" are any more because the really good all age setters have been bred to a lot of different bitches -- some very good, some not so good. Here's what I've observed.
I've seen Jetsetter dogs bred to Gridiron -- those dogs ran big and fast. The "knock" from what I've heard on Jetsetter pups is that they are very hard headed and its hard to keep from losing them. Having a big running dog is one thing, having a big running dog that will handle is another. I can't confirm this or not, but I've heard it from a couple of dog people -- horseback and walking trial guys.
I've watched several young shadow oak bo pups -- they run big, they seem to handle well and man do they have some freaking style. There's one little dog that was about 15 months old who looked fat. My buddy pulled her out of the box in Montana and I joked that he just brought her up there to get into shape. She ran like the wind for over an hour and looked like a million bucks on point. I'd have to double check, but I think that these dogs were Shadow Oak Bo X Carpenter's Last Jett (
http://www.carpentersenglishsetters.com/dog_Cindy.html)
I've had a lot of exposure to Hytest Skyhawk pups as well. One of my dogs is out of Hytest Skyhawk X Carpenter's Last Jett. He's a really nice dog a big runner who will adapt to heavy cover, but as one farmer who was watching me the other day observed -- that dog looked like he was going to take that fence row for miles and he will. I slogged to a 465 yard point earlier this season that involved nearly 10 minutes of mud-skating through a cut corn field. He held -- so did the birds. Needless to say, I am impressed with this dog.
I've observed a couple of Hytest Skyhawk X Barker's Blue Horizon and these may have been the nicest setters that I've ever hunted behind. They were both young in Montana this year, but had their heads on straight, big runners with impeccable style. If you look at the Carpenter's Kennels website, these two are "Duke" and "Hank."
I've been out of the dog purchasing arena for a couple of years now, but I found that in our area there are a lot of breeders who are looking to breed the absolute best. Give Jason Patty of Skyview Setters a call. For a while there, he was hitting a few dogs that were competing on the all-age circuit, even had one qualified to Ames. Give Larry Carpenter a call at Carpenter's Kennels -- he's a buddy of mine and very helpful.
Scott and Ben Berg are two folks that could not be more helpful in the english setter world -- and they've got red dogs for you too! They are Berg Brothers Setters in Minneapolis. I have a dog out of Berg Brothers Jack and Berg Brothers Blazin Bess who's a really nice dog that's developed quickly and as he gets into his prime will likely be a very good bird dog. He does not run as big as some of the others, but considering what some folks call "big" (not sure where you fall in) he's plenty big enough at 100 to 300 in CRP and 500 - 600 in open country/running lines.
I don't think that Alan Worth breeds dogs but he runs a lot of Hard Rappen dogs and they are impressive. I believe his War Hawk dog won the National Championship in NBHA last year and that dog is of Wild Wings breeding.