If you're looking for an "all-in-one" dome we have a 3MP Hikvision mini dome that has a built in microphone, excellent quality video, Alarm I/O, microSD card slot, and is very low profile. Hikvisions model number is DS-2CD2532F-IS.
We currently have it on sale:
http://www.nellyssecurity.com/camer...f-vandal-dome-3mp-ip-security-camera-274.html
If you don't plan to record directly to the camera I would suggest the Hikvision EXIR dome. Hikvisions model is DS-2CD2342WD-I. This dome is an excellent general coverage camera that can record at 4MP and really stands out when it comes to night shots. The large infrared LED produces a more distributed IR across the view vs the "flashlight effect" you see with many other cameras night shots.
It's slightly over your budget but well worth the money. Also, if you haven't used the IPCamTalk discount code yet you can get 5% off the order which should help a bit:
http://www.nellyssecurity.com/camer...wdr-exir-turret-ip-security-camera-2-8mm.html