@Malicious Metal. Need your opinion on some Morde builds

I've picked up Mordekaiser before I went to vacation and he was quite fun. My problem was, that I couldnt find a perfect build for him. I've seen your build with trinity force and will certainly test it out when I come back home, but I want your opinion on these builds I had used: My first one I HAD used, but didnt quite like it:

Rylais->Gunblade->Tank.

I didnt like it, because in Mid game teamfights I got bursted down by much everything, because I had 2 dmg items and no tank.

2nd one:

Rylais->Either zhonyas or abyssal->tank

Dmg + resistance, but I just dont like zhonyas and abyssal :D

3rd (the one I'm using):

Rylais->Protobelt->Tank

I liked this one, because protobelt gave me AP and health. The rockets prock Rylais and the dash is a good tool, to either catch up on ppl, or to get out of sticky situations. I was once chasing down a riven, but wasnt in range to ult. So I used Protobelt, the rockets slowed her, and I could kill her.

For boots I often go the CDR boots, but when the enemy is stacking MR, I go the Magic Pen boots.

So, these are the builds I've been using, and I can't find another place to discuss Morde builds.