best PDA/phone ung nasa sig ko but it costs P69,500... pda will vary on what OS you want kc PALM and Windows Mobile magkaiba, cheaper ang PALM, Windows Mobile is divided into WM2003 2nd Ed. na luma, a more stable WM5 availble in most pdas out in the market, and WM6 on most new, expensive and high end PDAs
features also dictate ur price: camera, 3, Wifi, KB and processor speed
15k will get u a 2nd hand unit guaranteed, u will not get a good/brand new pda at 15k