[Skunkworks] HP PDAs vs Blackberry vs Nokia smart phones

Hello, I urgently need advise concerning PDAs. * HP vs Blackberry vs Nokia smart phones - what is best? * Service provider terms and conditions - Blackberry had some terms and conditions from Safcom/Celtel. Are those restrictions still there? Someone please inform me a reputable Blackberry / HP PDA/ Nokia authorized dealer shop. I need to buy a few units. Thanks and kind regards, -- J. N. Kimani Fundi wa Mitambo