goran_10 :
raisonjohn :
In short, IF the 430W is the recommended PSU based on your needs (I am assuming you have correctly estimated it based on your total system load power draw), and these are the only 2 PSUs to choose from, then you can safely go with either (slight build quality based on specs would tend to favor the XFX; slight overcurrent protection (dual +12VDC) based on specs would tend to favor the Seasonic).
Thanks for the comprehensive reply. I guess I could also go for a bit more expensive variants (about 10%) - Xfx TS 450w or Seasonic S12GB 430w. Would it be worth it?
Yes, both the XFX TS 450W Bronze (P1-450S-GREN) and the Seasonic S12II-430 Bronze (SS-430GB) are considerable upgrades from the original 2 PSUs in consideration. Both now have 5 year warranties. Note that in the Seasonic, there was a similar S12II 430W (SS-430GB) but non-bronze rated -- don't get that as it is discontinued and have been updated already by the Bronze version.
What are your specs by the way (especially the GPU and the CPU)? Where will you be buying the PSU from (store location or website?)