If you have to pick between the two, I would use the Wyeast Saison yeast over White Labs (unless you can get the Saison II). The WLP one is just a real bear to get it to attenuate all the ways down. If you use it, plan on a second pitch of another yeast to get it to finish the job. Getting it really dry is key.
As for temp, I started mine at 68-70 for the first several days to get the bulk of fermentation going, then ramped it up slowly over the course of several days. I peaked out at 80 at the end, which got me the funky ester profile I was hoping for, without any of the hot alcohols that might have come out if it was at high temps all the way through.
Lastly, don't forget to let it condition for a couple weeks either in the keg or in the bottle - there can be a lot of rough edges in the beer right after it finishes.
Take a listen to
Jamil's Show on saisons, as it will talk through a lot of the temp issues. Plus there is a surprise visit from one of the White's to shed some light on the yeast.
Best of luck.
-Okt