If your teenager is into music and has the ambition to play in a real band someday, then I see no harm in buying them a studio microphone, but be aware that most of them are still a little pricey.
yes i would recommend getting a psp 3000 it has a microphone and umd (disk) drive. psp go only has a microphone and is more expensive.
Lapel microphone are the best for studio but if you are feeling that they are super expensive so please look at audio-technical Atm-510 and Shure SM57. These two models are less expensive and they have good quality also.
Yes, there is a microphone in the Dell Vostro 1550. I would recommend buying a newer model, because the 1550 is seriously outdated.
I would use the type of microphone that most people use in announcements, because it projects the sound better, as it is round. For concerts, I would recommend the cylinder shaped ones because the sound is amplified better.
The studio microphone must be installed where the sound is to be produced. It can be near speaking area but not near sofa or so as it may captured sitting sound.
Description of a microphone
I would recommend getting an eye exam every 1-2 years. If you feel like your vision is getting worse I would recommend getting it checked out as well.
I would look at the website http://www.recordproduction.com/microphones.html. They have Dynamic, Condenser, and Ribbon Microphones. You would have to look at the website because depending on which one you want and your price range.
Turtle Beach
A microphone would considered an input device.
That would usually be a 'studio'
I don't think that you could combo the two.. but if you are looking to get into either dance I would recommend a local dance studio for classes.