Need some Q's answered.(GPU,motherboard,supply)

Im buying some new components to my computer and i need some questions answered.
Im getting:
AMD FX-6300 3,5
Asus M5A78L-M/USB3, VGA, AM3+
Kingston HyperX Blu DDR3, 8 GB 1600 MHz (KHX1600C10D3B1/8G)

Now I curretly have GT 430 2gb DDR3. And a 550W supply.
Do you think its a good idea to replace GPU with something like HD 7770 or gtx 650? Im planning on spending 100-120 € on GPU.
Will my graphic card work in full performance if GPU is PCI 3.0 and mother board is pci x16?
Can i run those specs on 550W supply?
Which GPU do you recomend for gaming?

Thanks in advance!
3 answers Last reply
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  1. Cant edit: What i meant in 3rd question:
    Can i run this graphic card
    Gigabyte GTX 650, 1 GB GDDR5, PCI-E 3.0
    AMD Radeon HD 7750, 1 GB, PCI-E 3.0
    Asus Radeon EAH6670 1GB, PCI-E
    on this motherboard
    Asus M5A78L-M/USB3, VGA, AM3+
    1 x PCIe x16 1 x PCIe x1 2 x PCI
  2. Yes, the HD7770 is brilliant.

    Yes, it'll work on your mobo.

    Yes 550W is fine.

    The HD7770 is my pick.
  3. Thanks for the answers mate, any other suggestions on the gpu?
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