Which survey software to use?
I would go with Qualtrics, for the reasons you cite. 

However, make sure that when you pull the data out you export the questions all the possible ways, especially the .qsf version. Otherwise, when you leave the institution, you'll have lost the survey (because you can't log in to get it). This is especially important if you, or anyone else, wants to use the survey again.

Since my institution uses surveymonkey, and I find the idea of asking people to go to a monkey site abhorrent, I will probably install Limesurvey, but my proclivity to do things myself the hardest way possible is a personal problem.