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Siphon life should definitely be included in any spell rotation (well, unless the target dies quickly) - it constitutes a significant dps boost.
With 1000 spell damage, a single SL does (63*10+30/15/2*1000)*1.10 = 1973 damage before target debuffs have been taken into account, which is quite a bit more than you get from a shadow bolt (which takes longer to cast). If one does a simulation of a sustained dps cycle where spent mana is regained by LT/DP, one finds that overall dps is increases by roughly 4% by including SL.
By the same token, immolate shoud never be omitted from the rotation despite inferior +fire damage stats.
Edit: and someone else was faster replying making this post somewhat superfluous.
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