Companion plants

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I found some neat photos of Iris tridentata growing in the wild side by
side with Sarracenia flava...

http://www.pbase.com/jimfowler/image/79651374
http://www.fs.fed.us/wildflowers/beauty/iris/blueflag/iris_tridentata.shtml

...and it has inspired me to try in my own garden. I already have the
Iris tridentata, but not the pitcher plants. So I wanted to ask for
advice. There's many kinds of Sarracenia on the market... species &
hybrids. Is any one species going to be more reliably hardy for me? Or
otherwise easier to grow?

Forgive the cross-posting... some of you will get this twice. My
terrarium adventures with carnivores has me wanting to try some outdoor
carnivores now.

Dennis in arctic Ohio