Full Perle is your baseline set for high level. As its practically free, there's basically no excuse not to have that or better.
On a piece-by-piece basis, it's good, but there's better. For example, even common items like Dusk Gloves or Walahra Turban are better TP items due to higher Haste%, on an individual per-slot comparison. With Perle, the pro/con (as a TP set) is the set bonus. On the one hand, the extra 5% Haste you get from wearing the full set makes it rather competitive with much harder to obtain mix and match sets. On the other, you have to wear the full set for that bonus, and so when you inevitably get better pieces, you kind of need to have a plan for some of the other slots too.
Happily, for WARs, the Empyrean +1 armor is a very nice boost over older items, and the seals for it can all be obtained from relatively easy quests (though you may need to repeat them a lot, burning many a traverser stone in the process). The head is a nice WS piece, and the legs/feet are very good TP items, topped only by the +2 versions.
For a TP set, you can easily complement the Empyrean legs/feet with your choice of 'berk (or Store TP body if necessary), a Walahra Turban, and Dusk gloves to net a better overall set than full Perle. Other slots would likely be similar regardless. This
is what I'm currently using for /SAM, but several slots will get juggled if/when I get some other items to drop.
WS, Perle remains solid - it's not quite as good as Hecatomb, but the hands/feet are solid surrogates. Head you have Empyrean, but that's basically just a better version of Perle. This
is my current KJ set.
'course, if the trends follow, the next Abyssea expansion will bring us the Empyrean body and hands, which will likely become the preferred item for one of those sets.