5 Slow II
2 Dia III (Dia 3 is insane for melee zergs)
2 Phalanx II
Not sure on point #10 for me, probably Phalanx 2. To those who speak so highly for Para II, what is your gear like? Did you really cast Para I with as much MND as you could? I can't imagine Para II being much more effective if you were casting the first level spell with high MND.
I just can't argue for Para > Slow. If you give a tank the choice (only 1) between 5% more Slow and "un-defined more paralyzes", you would pick the Slow effect most every time. It's easier to get into a rhythm. The only time I could see Para being better is on a mob which is un-tankable in the first place and you have to rely on the Para procs in order to keep the tanks alive.
As for "if the tank wants Slow then someone else in the LS probably already has it"...uh? If RDM's in your linkshell already have P2/S2 and another with Phalanx2 then you should put all your merits in Dia3/Bio3 and cast it appropriately on every mob. I think the point of the thread is to determine which is most merit-worthy, not what fits best in your LS.
As for Bio3, that's up to whether or not you want to solo with it. Not really that useful over Dia for the Atk Down (maybe RDM/BLU soloing charby?), it's just a meritable DoT.
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