First off the 1915 is the best of the 3. Also the 1915 is not the ex same thing as the h1910. Its better , it has sdio and they all ship with pxa255 now ( so they say ).
Also I found out that pocket pc 2003 is going to be upgradable on all ppc's ( including those with 16mb of ram) threw rom updates , but only those who have 32mb of rom will be able to put the full 2003 on. The 1915 is possible going to better then the 1930 and 1940 ( not the 1945 though). The new 19xx's are going to have a new proc that is said to not be overclockable which means a 203/ 266mhz( 203mhz has a 100mhz bus , 266mhz has 133mhz) proc is going be slower then a hp ipaq 1915 overclocked. Also euro isn't going to be getting the new models that usa is getting as soon. I would say go for the h1915 , also you might want to look at the asus a600. If you can get the 1915 , go for it.
