i would buy a palette of GL 87s if they could be found affordably. otoh, Iron Man 55 showed that a $30-40 G/VG copy one day could become a $150 ebay copy overnight, so maybe there's a lot of money to be made buying the best $50-$60 copies of this book you can find because they might be $200-$250 copies later.
http://www.ebay.com/itm/Green-Lantern-87-CGC-9-6-1st-John-Stewart-/141219340278?pt=US_Comic_Books&hash=item20e1541ff6
At that price you have to wonder how much upside there is in slabbed HG though? (This market, however, never ceases to amaze me though, so I should probably shaddup.)
I've been waiting for Green Lantern #87 to pop every since Dwayne Johnson and Denzel Washington were rumored casting choices for John Stewart in the upcoming Warner Justice League movies.