I like the Counter Attack line from CSL Lighting (CAX series - xenon)

It is line voltage - if you are adding dimmers, it is cheaper to go this route, rather than low voltage.

www.csllighting.com

or Nora Lighting has some affordable "clip light" style fixtures

http://www.noralighting.com/cgi-bin/display2frames.pl?file=accent-decolume&pageno=1