GPU for an Athlon II x2 250 (3.00 GHz) on a PCI Express x16 1.0 mobo

What would you recommend?

I was thinking HD5670 - HD6750, within that price range. Between these, which would you choose (and why)?

Sapphire Radeon HD5670 512MB DDR5 128-bit VGA
Sapphire Radeon HD6670 HyperMemory 512MB DDR5 128-bit
HIS Radeon HD6670 Fan 1GB DDR5 128-bit
Sapphire Radeon HD5750 512MB DDR5 128-bit
HIS Radeon HD6750 Fan 1GB DDR5 128-bit

Maximum monitor resolution is 1920x1080, although I can probably game at 1280x720 just fine, so I think 512 MB will be good enough.

Currently rocking 2 GB RAM (which I'll probably get another 2 GB module soon).

PSU is a 550 W noname.

Motherboard has PCI Express x16 1.0, not 2.0, so please take this into consideration. Do you know if this limitation even affects low-end to mainstream GPUs at all?
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More about athlon express mobo
  1. "Motherboard has PCI Express x16 1.0, not 2.0, so please take this into consideration"

    If it's PCIe 1.0, you're going to have problems. If it's PCIe 1.1, you can use any PCIe card currently available, as long as your power supply can handle the load.,2997.html
  2. Problems how?

    AFAIK, HD5670 and HD6670 draw power from the PCI Express slot. Could that be an issue?
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