Well, slant 1960 cabs, from what I've seen, usually sell for around $400-500 depending on condition. Straight 1960 cabs don't come up as often, so I'd guess somewhere around $450-600 depending on condition. Heads usually list up for about $1800-2200 from what I've seen. Whether they actually get those prices, I don't know, but since 800s are in such heavy demand, I'd say they do, or at least really close.
Your market may dictate a different price, but that's usually what I see around here.