Bigfish 
Couple of things:
1.1) You seem to have missed the point of using /click in the first place those are (in relative order of importance):
a) able to macro a priority based rotation
b) reduce the dps loss of server confirmation inherent in normal /castsequence macros
c) modularise your macros
1.2) Arcane Mage rotation is extremely simple but is hard to macro as it is reliant on a proc
You have a few choices:
2.1 You can AB spam so no need for any macro - this is extremely mana intensive but you should be able to sustain it on most boss fights - at some gear levels AB spam is also the highest dps but not all - recommend using RAWR as the mage version is very good at theorycrafting the best rotation
2.2 You assume Missile barrage is going to proc and macro a rotation of ABx4, AM
2.3 You spam AB and manually handle missile Barrage procs
For 2.2 I would probably try macro like this (my mage is not 80 yet)
/castsequence ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, Arcane Missile (adjust to have enough commas to fit 4xAB in)
/cast Arcane Blast
make it into a clicky if you want and add trinkets etc
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