The Pioneer DDJ SX2 is a great all round controller, lightwieght and portable and packed with many features, perfect for use at a club or bar setting. 
 
Serato DJ
Slip Mode
Sound Colour Filters on every channel 
Crossfader curve adjust
Needle Search
Master level and channel level meters
Controls Traktor Pro2 (DJs need to download and set up the TSI mapping file) 
MIDI compatible
Professional build quality
High quality audio circuitry
Input ports
CD x 2 (RCA), Line/Phono x 2 (RCA)
MIC x 2 (XLR & ¼ inch combined jack x 1, ¼ inch jack x 1)
Output ports
Master Out x 2 (RCA x 1, XLR x 1)
Booth Out x 1 (¼ inch jack)
Headphone Monitor Out x 2 (front panel ¼ inch jack, MiniPin)
Other ports
USB x 1 (B terminal)