If you're going for a hybrid then I'd recommend Logan's. That way you can cap off your Int at 45, and you'll require less attunment slots than if you were to go with the TCC, so you'll save in that stat as well.
I like to use TCC on my pure-Mage build. But this one has 50 Att, so I can afford to halve my number of castings! Also has 50 Int, so if it were to be a hybrid build I'd probably have 20 Vit! Definitely not enough for PvP.
But like Carphil said, for PvE, Logan's is the best choice.
Why not Ring of Favor instead of Ring of Poise? The boost to stamina would be good, since you have low End (which I totally agree with; a mage doesn't need End). The extra equip weight could help too, and more health is always nice! I just feel like 40 poise, by itself, isn't justification enough for a ring slot. I like it to complement an incomplete armor set (havel's gloves and legs + Ring of poise, for example = 96 poise for only 23 equip weight). But 40 poise by itself, to me, isn't as good as what you'd get from the RoFP.