The Numark PT01 Portable Turntable is a great option. It offers excellent bang for the buck, is very lightweight and portable, and the sound quality is fantastic.
The main advantage of a portable turntable is that they take up less space than a conventional turntable. They are also easier to find through major retailers. A portable turntable is also small enough to be mobile.
Numark makes a cheap portable turntable that is easy to use.
The Numark PT01USB Portable DJ Turntable with USB Connection is what you need.
Numakr makes a portable turntable that is easy to cary, and easy to use.
Probbibly
The Crosley Keepsake is a good beginner turntable and can connect to your computer, but an advanced DJ may want a more robust turntable.
Stanton T.80 Digital Direct Drive Turntable with Stanton 500B Cartridge is a good entry level turntable for beginner DJ's
99 PNINIIIT
Any turntable will work just as good, get nice needles though to get a low signal to noise ratio.
T.90 USB TURNTABLE is the best turntable for portability
The Gemini VINYL2MP3 Belt Drive USB Turntable is an excellent choice. It is affordably priced, offers USB capabilities, and is from Gemini, an excellent brand.
Pioneer Electronics is a good place to start if one is looking to purchase a Pioneer CDJ 1000 Turntable. This particular turntable is also available on bidding websites at a discounted rate, such as Amazon or Ebay.