unless your bed is constantly full of stuff that weighs a lot, get the deaver f31 pack. it is a lot softer and you will like it a lot better. i have the f31 pack and can still haul a lot of stuff, so don't worry about that.
as for the shock set up, how expensive do you want to go? fox makes a bolt in shock for our trucks (offroad warehouse sells them for about 135 a pair iirc) that is decent for what it is and rebuildable/revalvable if you want them stiffer/softer or they start leaking. the kartek hangers paired with an extended shackle like camburg's will mean that you do not have to cut the bed, correct.
if you want to get fancier, you can do a cantilever shock set up like I have from dixon brothers (expensive, 1500 without shocks), or BTF fabrication (1000 without shocks). both are full bolt on and with the BTF kit i am getting 14 inches of rear travel with a 10" long FOA shock. no holes in my bed, but all the awesome. there are pics of the BTF set up in my build thread 'say hi to katie' and i believe i have made a thread just for the cantilever kit on here too.
feel free to PM me with any questions you might have and i can answer them for you.