A lot of people will say to look at Tein but I highly recommend taking a look at the ST XTA's. My car road much smoother with these and was much more comfortable over the stock setup.
http://www.ft86club.com/forums/showthread.php?t=100030
This video gives gives a breakdown of some of the good features of the ST's towards the end:
[ame="https://www.youtube.com/watch?v=c6rrCagn5gI"]ST XTA coilovers for the GT86/FR-S/BRZ - unboxing - YouTube[/ame]