SN21G5 high graphics cards that fit

I'm looking to buy an Shuttle SN21G5 now that my SN95G5 is dead. I have a perfectly working ATI All-in-Wonder x800XT in there, but it's not compatible with the PCI-E slot in the SN21G5.

Specificially I am looking for a single slot card(card and fan takes up one slot and fits in SN21G5 case). I have my eyes set on ATI's x850, x1800, and x1900 series cards. I am interested in the xt and platinum editions, but I have no idea which manufacturers make single slot versions of these cards. Also I am interested if the system's power supply could hnadle one of thos cards plus two 7200rpm, DVD-rw drive, and Athlon 64 chip.

I've looked into single slot solutions further. I was interested in the ATI All-in-Wonder x1900. However, my main concern now is power. Do you think the default 250W PSU in the SN21G5 can support this card?