Trying to decide on how much to drop.

[birdistheword]

I've never had or lowered a truck before and this is also my first short bed. I want to lower the truck a little and have a little bit of a rake to it. I don't want to bag it or anything crazy. I have a set of 15x7 slotted mags for it and picking up some 15x9s for the rear this weekend. I was thinking of using a 255/60/15 up front and 275/60/15 in the rear. The first pic is how it sits now bone stock. The second pic is of a board member's truck kinda how I would like mine to sit. I'm just not sure if a 2/4 drop would be enough or would I have to do something else?