I roll with the 250 HP shard mount. Reuse doesn't help SKs much IMHO, as most of our abilities are very close to each other in DPS efficiency...so there's not much benefit casting say Dreadful Wrath over Shadow Coil. Compared to other classes anyway.
Plus, being such a dot-heavy class, with too much reuse we will end up overwriting our own spells. Don't get me wrong, I'll take a JCap whenever I can

but it's more for the casting speed bonus than the reuse.
If you want to go the offensive route the 1% base SD carpet is better. But 250 hp > 1% base SD though imho.
Our SD/CA mod starts capping out at around 700. However SD/CA mod doesn't do us much good anyway because half our spells are AEs.