What do I need to watch out for when installing Mountain Lion from scratch?

I feel like it's a good moment to erase everything from my computer and reinstall Mountain Lion. I'd like to know which things I should watch out for.
Most of my important stuff is located on an external hard drive. Some of the applications are located there as well, the other ones I can simply re-downloading, I don't mind this.
I have my whole iTunes library and my iPhoto library which obviously I'd like to keep. I'm also concerned about my text messages on my iPhone -- they're very important to me. And so are also my Notes, Reminders, and Contacts.
The thing is, I do not want to do a fresh install and then reload a backup. What would be the sense of making this? None I guess... I'm doing a fresh install becuase I believe there's lots of useless files and maybe even dangerous files on my Mac that I'd like to get rid of. I guess that if I would load the backup, they would all be here again...
Is it maybe possible to load only certain things from Time Machine, for example my iPhoto or iTunes library?
Maybe someone can help me here, totally new with this...

Alright, I'm slowly getting ready to do this. Apparently I do not need an install DVD but I can just press CMD+R to get to the option to do a fresh install, that's why my Mac didn't come with an install DVD (that's what I've read and what I've been told at least).
Now I'm wondering... do I need to copy those items from the User folder at all? I mean, I have a complete backup on an external hard drive. I could just go there in the folders and select what I would like to copy to my Mac again, suchs as my music library or photo library. Is there any risks? I'm worried about even the smallest things, like creation dates changing and stuff like this. They mean something to me

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