OK - the 1550 came in PCI-e, AGP and standard PCI slot styles....
I am going to assume you know the difference and are sure its PCI-e.
With that said, under 100 bucks your best bet is either a 4770 or 4850 ATI card. Both will handle SH3/4 with no problem, and could probably deal with SH5 at low detail.
Your power supply will need to be at least 450W and have a 6-pin pci-e power connector. That is the minimum stated by ATI - but depending on your CPU - and other devices - 450W is pretty low.
To see how big the PSU is - just take off the side cover of the PC. On the PSU itself there will be a data plate/sticker that will give you its specifications.
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Good Hunting!
Captain Haplo
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