I'd go with the offhand upgrade. Your backstab refresh timer will drop by about .24s~ (7.87s vs 7.63) when you're unhasted. The benefit of upgrading your haste item is mitigated by haste, because even with celerity (shaman 50% haste) the value of that 4% haste is essentially halved (5.52s vs 5.4s).
Ideally you'd get a better haste item in a different slot so you can use a turtle belt (or dain belt) for the aura of battle.
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[60 Assassin] Tevh (Half Elf)
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