I have had an 11-87P for a few years now and it has become my primary SG. I have installed MMC ghostring sights on it and had it Vang Comped. The 11-87P is a very strong/robust SG and will serve you well.
Since Remington oficially restricts sales of L.E. firearms to the public they aren't that easy to find. If that price is for a new 11-87P, I think that is about what they go for.