Out of curiosity, does the Conjure Dremora Lord spell get affected by the Atronach boosting perks? Or does it have no boosts?

I was wondering the same thing. I chose the "duration lasts longer" for all atronachs.

Check out http://elderscrolls.wikia.com/wiki/Conjure_Dremora_Lord. I saw an error there right away. It is not true at all that you need a high conjuration skill to use it. I lucked into a spell book for it early on with my altmer, who I was initially developing as a pure mage (before giving that up upon discovering the weakness of destruction magic). She had over 300 magicka (including apparel boosts) and a conjuration skill around 30 when I found the tome in a chest. I was able to conjure this dremora immediately, and damn he's strong, especially at those early levels. Every other time I cast the spell, my conjuration skill would go up. LOL

Nice, guess it means I could use a Dremora Lord to supplement my Spellsword a bit.

Yes, I believe it does. I read it somewhere although I don't remember where and the usual time for Summon Dremora Lord is 60 seconds but in this video comparing summoned creatures, it's 120 seconds. I'll be taking the Atronach perk too and then I'll know for sure.

http://www.youtube.com/watch?v=JnHQ1ISQCcI

On the same note, do the perks that boost the stats on raised creatures affect the Dragon Priest summon? And do you have to keep wearing the mask to have access to the spell?

the one that extends the time of summon does the perk that increases the damage/health the potency one does not however