I put a Specialized Windie on my commuter bike last year. It was fine for my commute (20 mins) and errand running. My experience is that as long as my soft tissues are happy, other saddle fit issues don't crop up until I'm at 35-40 miles for the day. That bike was stolen last September, so I'm glad I didn't drop major $$$ on the saddle.
Is your commute going to be 90 minutes each way? That's a long way to go on less-than-great equipment. After my commuter was stolen off my back patio (and not the crime-ridden university area where I lock up each day) I decided to just ride my nice touring bike and get in the habit of locking it up textbook-perfect with two locks every time. I additionally invested in a saddle lock and a cover and haven't had any trouble. Brooks saddles seem to be in fashion around here and there are usually several parked with 100 feet of my bike that look nice and new (as opposed to mine, which looks like it went through a war but is nice and comfy).