It's worth it if you're OC'ing with hardcore performance in mind, they're more stable with the tighter timings. You can always go with the PC-5400 instead of the PC-6400, NCIX has it listed at $220 CAD for a 2GB DC kit which is a little cheaper. If you wanna stick with the PC-6400 just go with the 5-5-5-12 for about $280 CAD.
EVGA 680i SLi
E6400 @ 3.0 GHz
4 GB OCZ Platinum Rev. 2 EL @ 880
400GB + 250GB Seagate Barracuda SATA2
Antec P180B Case