Hmm....you just need to look at your disk connectivity vs. fabric connectivity carefully.
The 2050 has (2) onboard FC ports which can be set as either initiator (to support external disk shelves) or target (for fabric connectivity). The 2050 also has (2) GigE ports onboard.
If doing a best-practice FC setup, you'll likely want to use the 2050 expansion slot for additional FC ports -- so you can have 2 FC ports for disk (preferably MPHA although not possible if you want both SATA and FC external disk) and 2 for fabric connectivity.
Having said all that, we don't often see customers using the 20x0 line for FC connectivity....just as FC infrastructure is expensive enough that most people who can afford it/have sufficient need for it also end up needing (and being able to afford) a 3140 system or higher.