Too many projects!!!

[SeanPaintsFlames]

THose 67-72 body styles are, at least around here, a dime a dozen. The guys say they've spent over $20k on them, try to sell them for $15k or so, and they sit on Craigslist forever. The un-hotrodded ones can be had for under $2k. The 60 is far more rare, especially if the hood hasn't been swapped out for the much more common 64-66 hood. I think, though, that if it isn't a complete, straight truck, you're going to spend a fortune getting to a sell-able state because they're not as common.
The 87 should be a good ol' truck. Here in Ga. they still bring good money if they sound good and are shiny. A clean and complete interior will bring much more money. If you get into the super custom bagged trucks and the bigger wheels, you're going to have it for sale a lot longer and take a much bigger hit.
I'd keep the 87, keep it relatively stock, and drive the crap out of it. With the economy the way it is, everybody with an old this-and-that in the garage has flooded the market with them, making prices go way down.

I'd stay away from the 67
I'd pick up the 60 if you can paint it yourself (and make it look good), if it has a complete and updated (like... carpet) interior, and you can get it for under $5k.