I might have a suggestion for you. First thing, live music is expensive, so I hope you are prepared to open you pocket book!
My wedding planner, Denise Taylor's husband is a Raggae artist and producer. Quick story, we met her in March (our wedding is coming up in November) and she did not mention this at all. It was by assident I put it together a month later.....by her last name and his video on itunes. I was downloading raggae music and came accross his music on itunes. I quickly feel in love with one song, Raggae Street, and included it on a raggae CD we sent with out invitations. He is really good.....you can Google him and read about his carrer...pretty impressive. His name is Chockey Taylor and his band would charge around $2000 for 2 hours I think.
If it's entertainment in general you want and something cheaper fits the budget....maybe fire dancers? They are always awesome to wat and I think you can get them for $250 - 500.
Hope this helps. Let me know if you want any contact information.