How does Windows 8 have too many bugs? It's an incremental improvement over Windows 7!? Granted developers are behind on it (nothing new). I've installed Rockwell Software on it without issue even though it isn't supported yet.
Personally I have a 17" Dell Precision m6600, it's got all the bells and whistles, not cheap but an outstanding computer for development. With that said, I'd prefer a 15" screen as the 17" does not travel well (but I manage, I know life is hard at times), however those can be hard to come by in a decent resolution (1920x1080).
In the past I've had the Dell Lattitude line and have always been happy with them. For spec's I'd recommend a 15" 1920x180 screen, 256 SSD hard drive (2nd hard drive bay in case you need more room later), 8+ GB of ram and Windows 7 Pro as others have mentioned.