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Slotted rotors won't really gain you anything, and will shorten pad life. I'd keep stock rotors.
Flush fluid with fresh DOT4 of course.
Pads:
Stock power level I'm betting a lot of people would do fine with Hawk HP+ pads. They do dust a ton, and squeal like mad until beaten into submission at the track. Temperature range isn't as high as dedicated track pads, and apparently when they go off it's very abrupt, but I've never had a problem running them on my stock S2000 at the track. Very grabby and grippy pad, more so than Carbotech XP8 and XP10 pads I've used. It's almost like having a supercharged brake booster! Some like this (I do), others do not.
Carbotech XP8 are more $$$ but have a higher temp range. Dust of course, brownish and cleans up easily enough. Squealing is almost nonexistent after track use, and it's actually a pretty streetable pad. I've dailied the S2000 for months on end with these.
XP10 is another heat range higher, but I doubt it's needed for a stock-hp FR-s/BRZ. Also quite streetable, I've run it on the RX-7 for months.
StopTech "Street Performance" pads might be OK. Had them as streets on the FD, but never tracked them.
You might try the same compound front and rear. I know a lot of people insist on higher-spec pads in front, but for me, in my cars, I like having the same compound front/rear.
Lower-spec rear pads can have you underutilizing rear grip and can reduce overall braking performance.
That said, if there are stability issues in the braking zone due to too much rear brake bias, then going to a lower c.f. rear pad is a good way to depower them.
One more thing: The "right" brake pads for one driver might be different from the "right" pads for another driver! This is true even at the very highest levels of motorsport. Some drivers are just harder on the brakes than others, and of course preference for initial bite, responsiveness, and "feel" varies a lot as well. Ultimately you and only you can really determine what is best for YOU.
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