I would also like to know which games you've made. I'm starting as an indie game dev myself but I have a good amount of experience on the App Store (and 5+ years of writing games for mobile devices as an employee). I can give constructive criticism too if you're willing to get some.

I suggest you look into Unity 3D. It's easy to make 2D stuff with it, even if it's primarily a 3D engine.

The basic version is free, so you can use that for development. When your game is ready to ship, you can upgrade your license to an iOS one and then convert and ship your game with it.

If you want to stick with XNA, there's an interesting project to port XNA to iOS platforms (http://rockethub.com/projects/752-exen-xna-for-iphone-androi...), and there's XNATouch too. I haven't looked into those yet, but if you complete your game on XNA, by the time you'll be done there might be a viable solution to easily port your game to iOS.