Which brewers/brewhouses do a great job across their "menu"? The ones that brew a variety of styles and have a good beer at most every style they put out? Include at least one for East Coast and one for West Coast if you can.
For east coast, I'd say Brooklyn Brewery. I've had their witbier, weissbier, stout, porter, lager, and abbey ale, and all were great.
For west coast, my list is longer (only because I live here and know more of the brewers):
Ballast Point - Pale ale, IPA, porter, witbier, ESB, barleywine
Stone - Porter, stout, IPA, pale ale, amber, barleywine
Alpine - wheat, IPA, stout, pale ale, lager, red, barleywine
AleSmith - pale ale, IPA, stout, scottish ale, nut brown ale, belgian, barleywine
Colorado isn't west or east coast, but it would be remiss to leave out Avery Brewing. Adam Avery makes awesome witbier, IPA, porter, stout, and abbey-style belgians.
West Coast I'd add North Coast in Ft. Bragg, Old Rasputin, Old #8 Stout, Scrimshaw Pilsner, Blue Star American Wheat, Pranqster, Old Stock and Red Seal are all solid. Their ACME line of Pale/IPA/Brown is also good.
Russian River, I've never had a Vinnie Chilurzo beer that wasn't well above average.
For top-of-the line microbrews widely available in the Chicago area, the following are my favorite "diverse" lines:
Those are 3 brewers that rock and then some. Rogue is pretty darn good too. North Coast is good. A little microbrewery in Kansas City has a limited but excellent line: Broadway Brewing.