No, I'm sorry you can only rent video games and if it says that you can buy the certain video game that you are looking at then you may buy that game if you wish but you cannot buy/rent any type of consoles or equipment.
I do not own a wireless keypad but I do own a wired one and it is much better than using your controller to type. I have the big kind like for a computer so if that is what you are inplying than it would be a very good keypad I would have to say myself.
Yes. The Call of Duty Sersis is made from Infinity Ward and Treyarc and they will most likely continue making them for a long time to come and if they stop making Call of Duty games another company will step up and continue making them. As for the next one there is strong speculation that Infinity Ward will be making Call of Duty: Modern Warfare 3. I hope I helped you out and have a great day :)!
Portal 2. I do have PSN but if I wouldn't I would still buy the game for the storyline. Of course I wouldn't now because I watched videos of the whole storyline on YouTube but that would probaly be the only game that I would buy only for the storyline at least if it is an expensive game.