I wouldn't hesitate on a new 11-87. I do recommend replacing the newer piston ring setup with the older style.
I've never had the two-piece old style break in any 1100, nor have I replaced them for that in any 1100 I've worked on; the new 'snap-together' one that came in in my 1100 Competition Synthetic cracked after 3000 rounds. I replaced it with the two-piece old style.Is this what you're referring to piston seals? The new ones snap together as one piece. Why is the older one better?
Yes, good solid gun, and the new ones don't have some of the problems other Remington products have had lately.2) Is the Rem 11-87 new a good buy in today's market of semi-autos? For the $ it's all steel, proven, and lots of spare parts available for <$800.