Take the Samsung SSD for reliability. It's not even a question which one you should choose if you have to do real work.
Corsair for PSU.
You'll need 16GB of RAM at least to keep everything running smooth. I would think you will need more than 8 GB doing this type of work. It really depends if you are doing a character model or a huge map. That's something only you'll know. Autocad can use more than 8gb also. It really depends on how complex your work is. Honestly, if you are asking this question then you probably don't need more than 8gb for now. But 16GB is so cheap that you might as well buy it.
Of course i7 is the logical way to go.
The rest is just preference and features and you'll probably want to go for something that is the most comfortable for you.