Last year, I bought the TEAC Reference PD-H300 CD player to use in my office, and I've been quite pleased with it. Subsequently, I recommended the "300" Reference series of components to my company's Buyer, who had been asked to assemble a decent but inexpensive system for use in our company lunchroom. The Reference 3-disk CD player and integrated amp (50 wpc, as I recall) that she bought for the lunchroom system has performed just fine (the speakers in this system are an old pair of B&W DM602's that I donated). Based on these experiences, I bought a TEAC Reference system for my wife's office: the same CD player I have in my office, plus the 30-wpc integrated amp, and the tuner. My wife has a fairly critical ear, and has been very happy with the system (which includes a pair of Snell monitors).
The one caveat I'd give you is to buy the 50-wpc integrated amp (unless you intend to buy the receiver), AND get some fairly efficient speakers (I'm using a pair of Krix Equinox speakers, which are rated about 90db efficient). Kids tend to listen to music at fairly high volume levels, and this can lead to clipping and distortion which can burn out the speaker (usually the tweeter). Buying the higher output power amp, and combining it with more efficient speakers, may avoid this problem. Do caution your teenager, however, that this system is NOT intended to be played at public address system levels.