PRS: Has to be my first PRS and still my favourite, my Santana SE1, tobacco sunburst, trem (blocked) and a big box of EB Cobalt Slinky 0.12s
Non-PRS: Without a shadow of a doubt my Collings OM-2H and PLENTY of Martin 0.12s
I'd also need a box of 1.0mm Dunlop Nylon picks, I'm sure I'd still manage to lose them even on a desert island!