Hi,
First things first: I moved to Pulsnitz these days, so now I'm just waiting for the gateway to start experimenting 
Nice to hear that someone from within Dresden already has nodes but in fact I never heart from anyone within Dresden interested in running a gateway.
I just mentioned Bühlau (and Radeberg) because I personally think with these locations the whole area north-east of Dresden could be covered. Including gateways in Langebrück and Klotsche would even cover everything north of the city. Of course more gateways within the city are needed as well. I guess right after receiving the gateway it's time to finally get in contact with Freifunk Dresden (http://www.ddmesh.de/). If you want to do that just link to this thread to invite them 