are you going to do any overclocking? that would be the onyl reason id look into the fx55. if oyu wont be, stick to the ahtlon 64 3800+
as far as pci-e, some may doubt it, but i think its possible you will see capable boards this year, in november or december at least. the only thing you might consider though is if youd like to make use of the sli feature, but that would mean you buy an nvidia video card, so its up to you.