Honestly, the Raspberry Pi is ridiculously simple to set up and pretty bullet proof once it is.
I switched to the Raspberry Pi over a year ago and it's been running non-stop ever since.
Well thats a lie, it's been off when I've had to turn the electrics off in the house, but other than that it's back up and running without intervention when the power comes back on.
If you decide to go that way and need a bit of help, I can point you to a great and very easy to follow guide, even if you know nothing about Linux. No as far as port 5353 goes, I don't have that open for the Pi.
And of course we're here to help if you need it....... Though based on the success we've had so far with the Synology