Have you tried a lot of the most popular juices? Please ignore this if you've tried most of these, but if not
*Alien Visions - Boba's Bounty, Gorilla Juice, Havana Gold
*Copper Creek - House Blend
*Nitelite Vapor - Bounty Hunter, Renegade, Line Rider, many others (This company can be tricky to order from, can't accept credit cards ATM, but they take cashier's checks or USPS money orders)
*Heather's Heavenly Vapes - Gandalf, other tobacco blends, heck pretty much anything from them
*Rawr - Poison(a new FAVORITE tobacco juice, OMG i'm hooked!), JY4, Truth Serum, etc.
*Hot Vapes - Hazelnut Praline (Not really a popular juice, just by far one of the best juices i've EVER tried, give it plenty of time to steep though, it's not that it's bad when you get it, it just tastes so much unbelievably better after steeping for a while)
*Clouds of Vapor - CPN Butterscotch (another new favorite of mine, but has been one of the highest rated liquids for quite some time, it's not sickly sweet like you might expect, easily an all day vape, in CJ's(vapingmonkey) review he shows like handfuls of empty 30mL bottles, one he's working on, and 3 full 30mL's and YES it is THAT good )
*Backwoods Brew - Many to try, just a few are Casablance, Honey Flue, 555/555 exotic, Malty, Bacco
*Halo juices, Never tried any but VERY well liked by a lot of people
*Vermillion River - Kentucky Premium Blend(This company won GuideToVaping's 2011 Best Juice Vendor poll), many, many others
*Pink Spot - Pink Spot, and i'm sure others (haven't tried them either, but again, VERY highly thought of by many)
These are just SOME of the many excellent vendors and juices out there right now. Try what you can, you may find that there is an all day vape waiting for you if that's what you want. Personally I tend to switch it up between anywhere from 1 to 5-6 flavors in any given day, depending on my mood