Congrats on baby girl. I just a posted this on another thread. Here's my opinion:
After researching and looking at the pros/cons, I recently purchased a Phil and Ted, and I love it. I wish I had more knowledge of strollers before I registered for my Travel System, which has been retired.
I am currently using the P&T as a single, but if/when we decide to have #2, I would just purchase the doubles kit for it. It truly rides really nice and DD is very comfortable in it. It is not a "jogging" stroller, but can be for light jogging. This is neither a side-by-side or a front-and-back, it's more like a top-and-bottom.
When used as a double, it is as wide as a single. The only "bad" thing I can say about it, is the fact that there is no tray for DD, so I will be purchasing an "add-on" feature for her.
I believe there is an "add-on" feature you can buy to accommodate your infant seat.