I think temps of PCU looks fine, but gpu could be a little bit lower. After 3 min.. so i check some info about that gpu, 560Ti stock version had 29/75 C (idle/full load) but your card have much better cooler and in some test I found 560Ti TwinForze with result 26/61 C (idle/full load).
But it doesnt hurt to go lower. Your safe at those temperatures but any more higher than that can be dangerouse.
You say its in your cabinate. Thats the worst place to put it, because it means its in a confined place. Best place to usually put it us on the floor where there is nothing around it, like in open space, make sure there is around 5 inches of space from each side AT LEAST, and i would say more than a foot of space front and back. Another good place to put it is on the top of a desk.
Also is there no more space for another fan? If you have no side fan you can insert one to blow air into the cpu.
Also another question, your build, does it bring air in from the front, and relesae air out from the back? It should be that way, unless your psu is located at the front then its ok. Basically the psu blows hot air out, and if the intake fan is at the back, your intaking hot air. So all your hot air should be on one side of the pc.
i have this fan, and if you have enough spare 4pin connectors on your psu, then really go for 2 - 4 of these fans. With 4 of these it should be very cool.
you could go the other way and get an aftermarket cooler for your cpu and your gpu.
As im not too well knowledged about after market coolers for the 560 i wont comment. I do know that for the phenom the hyper212 is a great cooler
Also there is the arctic cooler range which is also very decent. Someone else more pro than me can comment on this.
And hopefully someone more pro can check my reply for any mistakes
But yeah i have 3 fans on my pc, and adding the 3rd fan which was a really old 3 pin (had to take out 2 pins, leave the white pin in, and put the black and red one in the 4pin molex to get a 7volt speed) really lowered my temperatures. Only reason though is because mine is in a confined space meaning that it finds it hard to get enough air, and theres no other place i can put it at the moment
It really depends because if you have the money i would go with both.
But if you have a decent mount of money to spend go with buying aftermarket coolers for both
If not much money but still want cooler pc, go with not 1 more fan, i would say a minimum of 2, it would be best to get 4 however, or do you not have enough 4pin connectors for more than 1 extra fan? damn... If not do you have any 3pin spare slots on your mobo? If you do use that.
If your goinng to do alot of overclocking, like alot, then go with after market cooler. Thats far more important, if its just general cooling then fans.