The OS really won't matter for the EDGE/edge difference what will really matter is the Radio file. You can take any OS and insert whatever radio file into and it will work. Here are the radio riles others have had good luck with
.90 - the best for connection stability but most users get random reboots with it
.151 - seems to be a very close second (but some edge users have said it is horrible)
how much did you pay for your unlocked storm??????
Watkins you don't have to pay anything for a Storm to be unlocked. If you have had your phone with VZW for more than 60 days all you need to is call VZW International CS and they will give the unlock code for free.
and also if you are like me and not care for some apps that do require TCP/IP settings, then all you do is uncheck it. (This is for unlocked storms running on networks other than VZW)
Blackberry App World and AIM for instance work with no apn settings.
If you can live without certain apps that DO require apn, then .90 radio is for you. If not, then .151 radio works wonders.
I guess the no apn setting everyone tries to avoid, but to me this is the easiest way to bypass the VSOD and random reboots people have had with .90 radio. I myself have not tried .90 and don't intend to.