I have actually done both. Having that extra 5 mana regen and 100hp from Dorin's Ring makes a big difference all game long. Meki Pendant is pretty good to start with if the person you are laning against has a heal such as Vlad or GP because you are going to burn through so much mana early on. If you are laning against someone like Annie or Leblanc then Amplifying Tome is better, they will lose hp quick. Doran's ring has just done well for me. I have been able to stay in lane longer and survive with that extra 100hp from Doran's. I say just pick and choose what you like. The extra 5 mana regen is needed all game long anyway, so I just go with it and get Meki second and then boots.
Thanks for the +1 and for the input.

Very interesting build. Rather solid guide as well. Have you tried starting with a meki pendant and 2 hp pots or an amplifying tome instead of a dorans ring to get into your build faster?

+1

If you use Teleport properly it's amazing. Being able to push multiple lanes and gank and jump right back in your lane and keep pushing. Going back for a real quick heal. It works very well with my play style at least. I do agree her speed is so good it doesn't always matter, but if you need a quick turret save or get to a turret just in time with tp to save a teammate it's 100% worth it and I do it all the time. I actually can't think of a game where tp wasn't exactly what I needed.
Thank you for the input, I'm still looking at ways to make this guide better.
Don't forget to rate.

I dont think Teleport is a good choice on Orianna due she can easly move very fast with her W-Skill.