sure, an ssd would be fine and fits the budget. i was trying to keep it simple.
the case is one that i currently use. not the best if you want ultra neat wire management, but i think its a fine case for the money.
i dont really recommend getting warranties. on anything. i mean, if you were sure that something was going to break or your baby brother was going to smush a pb and j sandwich into it maybe. but thats probably not covered. everything is generally covered for a year anyways. save the money that you would spend on the extended warranty and make that money the insurance policy for something that breaks. which in my experience rarely happens. 9 times out of 10 if something breaks, it will arrive that way.