I would suggest leaving the springs & shocks alone for now (well, if the shocks are wiped, then just get decent replacements at the auto store)
since at 15 he's really just starting, I would go with a 1" body lift and 1/2" to 1" lift shackles. this combo will be the least expensive route and still allow him to fit 31s on it. Then if/when he decides he wants to keep it and build it up more, he can keep the body lift and shackles to supplement whatever suspension lift he chooses to buy.
as far as Rough Country goes, most around here shy away from them (or run away screaming)... they don't have the best reputation for decent ride or spring longevity. Most find they tend to sag quite a bit over a surprisingly short time
Sean B. - Schenectady, NY - 95 YJ, 350/700r4/NP241, JB Shorty SYE, 8.8 rear, 2" BDS, 1" homebrew shackles, Daystar 1" BL, TJ flares, 35x12.50 General Grabber AT2 on 15x10 Bart D-Truckers, Polyshield polycarbonate windshield, HD over/under crossover steering
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