Does it have a large double din size with a screen?

Yes. the buttons are small and I need glasses to read what they are. No manual to help me.

if you can find the model you can get it online!

I will look at it tomorrow is I get the Miata seat done.

It shouldn't be hard to find online!

It had a place for a SD card, iPod and DVD/cd

well then it will be more than likely have a camera port!

I need to make MP3's and put them on an SD card . Should be better than a CD.

or get a i-pod!

I have my iPhone I use at work sometimes. I have several SD cards from one of my cameras.

that will work too!

I never wanted an iPod.

The I-Phone is the same thing except for the phone part!

I originally had a Samsung that I could watch TV on but the battery got drained even when it was not in use. So I switched to the 3G iPhone because it was only $99.

the 16 GB, I have the 32 GB 3G, it does what I want so there wasn't any need to upgrade to the 4, I have the newest 4.1 OS anyway.