DELL is a good choice.
You don't really need much power for the tasks you've described, just drive space according to your requirements. ANY today's server will do just great.
I don't have PE4600, but I've installed SME on all range of PowerApp servers and on PowerEdge 400, 600, 1600, 2550, 2650, 2600, 2300, 1450 with great success. I'm sure I've missed some more modeles, but you've got the point.