Infraction: 2. All opinions should be stated as succinctly as possible.
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Please refrain from quoting the entirety of a lengthy post when possible. Fully quoting such posts needlessly lengthens the page and makes it annoying to read.
Ok, so lets look at this again than as you are right that was pre GoLT, so In order for that gear to be better you would need to preserve 2 pc and from the aditional pieces gain 177 spellpower in not only spellpower but stats.
177=300*.39 (demonic aegis) +(200*.2)
Lets assume we are just replacing chest, pants and helm and 19 spelldmg gems only (meta is not a factor) and all spirit is factored in as spelldmg assuming .39 conversion rate (rounded down) all other stats will be added at the conversion rate listed below.
The question is how do you weight stats? Leaving them out of the equation completely doesn't work in the real world, but just comparing straight spelldmg we get this
Chest options are either:
Just using spelldmg you see a 73 seplldmg increase in the other BiS gear. This is not factoring in (as stated above) other stats of any sort which could sway it one way or the other (leggings of the wanton spellcaster for instance are, in my opinion, much better than mortal arrogance, if you can remove the hit from some where elsem also factor in set bonuses etc, you definitly gain much more than that on your gear set from the BiS. Zak if you have a better way of seeing that please let me know.
You wouldn't have to use the T7 leggings to maintain the T7 4pc bonus. Being able to maintain the bonus while still using the Mortal Arrogance or Wanton Spellcaster leggings (depending on how much hit you need) would be the best option. The only real hard loss i see in swapping out the BiS gear is the Hood of Rationality which is much better then the t7 alternative, and possibly the Robe.