the only aspect where all spring would be decent as opposed to flip and spring would be mud.. you'll flex vastly better with the flip.. and if you ran 6" 56's without a flip, you'd be wasting the time to move the stock hangar.. the easiest, cheapest would be 6" 52's, which will ride like arse...
stock 10 bolts won't last long if you don't baby it... 14bff are a dime a dozen for the back, its that front 60 thats gold.. i know i wouldn't wanna run 39.5's on balljoints for too long.... some here may disagree and have had good luck, i just think its a real stretch strengthwise...