T20 configuration questions

I am considering a Poweredge T20(for home use).

Now,I see it doesn't come with a DVD Drive,which is a slim drive,I see,so is there an option during purchase to add one,or to purchase one after?

I guess I could always install an OS via USB Flash Drive.

I see in another post that  there is one motherboard config only,so that said,I could buy the G3220 now and upgrade to the Xeon later?