You did not tell us which Mac you are using.
All camcorders have manual and auto features. As the camcorders get more expensive, the manual features are easier to get to (on the outside of the camera rather than through a menu). High quality video can be captured by nearly any camcorder - if the conditions (lighting, audio) are good for that camcorder. All camcorders can "add a light" - some have an accessory shoe, some you need to add an accessory shoe to the camcorder. How long does the video light need to last? You don't want to tie it to the camcorder's battery because that reduces camcorder battery time. The ones with internal batteries usually last about 20-30 minutes... so external battery pack? A few consumer cams let you add an external mic.
MiniDV tape based camcorders connect to a computer using Firewire. Most Macs made in the last 10 years have a firewire port - the exceptions are the MacBook Air and the newest MacBook... no firewire port. Canon ZR900 and ZR930 are entry level miniDV tape based camcorders with a mic jack. You will need to get a camera bracket if you want to mount a video light and/or an external mic. Bower makes a cheap bracket with two cold shoes (mic, light). iMovie will import the DV (or HDV) video directly over firewire.
Hard disc drive (HDD) and flash memory cams connect using USB. After copying the data file, if the video is standard definition, you need to convert it with StreamClip. Any version of iMovie can deal with this converted standard definition file. If the video is high definition, you need to be using the CURRENT version of iMovie - earlier versions won't deal with AVCHD files. HDD camcorder have know issues with loud audio causing vibrations that shut down the hard drive heads so no recording happens. High altitude (over 9,800 feet) causes the hard drive heads to park too. HDD camcorders fall off the short list.
Flash memory and miniDV tape remain on the short list and depend on your budget and other requirements.
DVD based consumer camcorders barely make useful doorstops and don't make the short list.
The Canon HV30 and Sony HDR-HC9 are consumer miniDV tape based camcorders with a mic jack and manual audio control. The price of the mic and lights depend on what you decide to get into...