i like the saison yeasts, i prefer the french to the belgium, but to each his own. With either, I do the full ferment at room temp (72-78 degrees) in order to get some ester flavors. I've done both at 67 degrees and didn't get anything interesting from the yeast. Though I got a fine beer.
And I get very little krausen from the saisons, but they do ferment for a good two to three weeks. give them warmth and patience and you've got a great beer. I use mostly 50/50 2 row and white wheat with a little 20 L thrown in for sweetness.