Thanks for the heads up on BB10. I will give it a try. I believe I have the SDKs but will have to look. I assume that you had to download all that to get moving?
Of course, I write the apps in such a way they resize to all screen resolutions but you can hard code a version specifically for each device. I position all the views with fractions.
The signing process is kind of complicated but not impossible. Because of my first app, they gave me a playbook which I sideload my bar files on for testing, but this portathon that starts tomorrow, I should be able to get the Dev Apha(phone size BB10 app testing hardware for devs)