Cuffs are alright, but if you are really just looking to get one toy, I'd go for the G4. Restraints are easy to find/get/make--just grab some rope from the hardware store, learn to tie a knot or two, and you're good to go--but quality vibes like that? Not so much.
Since this thread was started back in 2012 I won't really make a selection. However, I will say that IF one has a willing partner for pegging, then the Share "strapless" strapon would be the best choice. Oh and for those who are considering pegging please use a harness even with the "strapless" toys. You can't go wrong that way.
I really hope the O.P. has decided on an item to pick by now. Anyway, I'd narrow it down to the strapless strap on that Ron Lee mentioned and the toy from Icicles. Once I did that, I'd pick both of those up. This way, you get one for you and one to "give" to him.