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I have not tried the 21E so cannot comment on it's performance but I would think 70x mag is not too high in a 12". The 31N and 20N is a very nice combo but at a greater price. The 20N is small and light compared to the 31N and 21E. Coma seen may be more objectionable in the 21E due to its wider field stop than the 20N. The coma seen in the 31N will be the greatest but less magnified so may actually be more pleasing.
Back to your original question; if you are pleased with 68 deg views get the 35 Pan, but if you crave for a wider field then get the 31 Nagler and add a 20 Nagler later when you can afford it.
Perhaps others with a 21E and have used one in your type of telescope may want to chime in here with some further advice.
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