I need a camcorder with a feature that can plug in a microphone?

You don't seem to actually know what you're looking for, you haven't included any of the important information required to answer this question. Consider the following:

1. What is your budget for the Mic?

2. When you say "good quality" what exactly do you mean? Should the mic have a wide or narrow spread? Are you looking for pro quality sound or are you accepting quality will be proportionate to budget?

3. As a general rule, lapel mics don't attach directly to your camera, is there a particular reason why you want that feature?

4. What kind of mic connection are you looking for? 3.5mm, phantom XLR, hot XLR?

5. Given you won't be far from the camera, are you sure a lapel is most suitable compared with something like a shotgun mic?

6. 1080p and 720p are just the resolution and don't say anything about image quality. With that in mind what kind of image sensor are you looking for?

7. Is image quality in low light situations important to you?

8. What is your budget for the camera?

9. Is a view finder important, or will a flip out LCD be fine?

10. Is manual focus an important feature, or will auto focus be fine?

11. What frame rate are you looking to shoot in?

12. Are you looking to record in a lossless file format or is compression ok? If compression is fine, what kind of compression and how much compression is ok? (All compression will effect image quality).

13. Are you looking to record directly to an internal hard drive, or to external media? Or would you prefer to record to both at the same time?

14. Due to format limitations some cameras have clip length limits, how long do your shots need to record for?

15. Will you ever be using the camera for anything other than just saying 10 feet in front of it and talking?

16. Will the camera be tripod mounted or will you have a camera operator? ie. do you need a remote control?

17. Do you need manual white balance control, or is auto white balance fine?

18. Do you need any other features?

These are just the starting questions you should consider, there are plenty more, but lets start by answering these questions first.

Is this a one time need or something you will be doing a lot of? If it is one time or infrequenct need then rent instead of buy and get a pro camcorder with XLR inputs. You will need to buy some XLR audio accessories as well but all of these can be rented. I rent for jobs at LensRentals.com and I would get a Canon XA25 from there with the XLR stuff. This camera gets you pretty much everything you would need on your want list. The rental for 4 days will be around $165 for the camera.

If you need to buy you will spend around $2,000 or more for a quality XLR camcorder. A nice model for under $2,000 with XLR is the Panasonic AG-AC90.

My rule is rent for jobs and own if you are going to use it all the time. Eventually rental costs will exceed the price of the camera and then it is better to own it. The great thing about renting is you get high end results without being out a ton of money. You also get to try out different cameras to determine which ones best fits your needs.