My White Box original D&D. I have everything crammed in there except Blackmoor (haven't secured that hardcopy yet). But basically, the White Box is D&D in its raw form and totally gameable for the rest of your life as your only RPG.
Runners up include the Moldvay/Cook Magenta and Cyan boxes in top shape (the Expert was actually in shrinkwrap when I got it... my present to myself for passing my PhD comps!) and the Chaosium Ringworld boxed game plus Companion.
Runners up include the Moldvay/Cook Magenta and Cyan boxes in top shape (the Expert was actually in shrinkwrap when I got it... my present to myself for passing my PhD comps!) and the Chaosium Ringworld boxed game plus Companion.