With the extra RAM that machine should work great for your use.
Regarding the video card, the standard Geforce 7300 should be fine to drive two CRTs. The card has two DVI ports. What type of port does the CRTs have? VGA? If they are both VGA (and neither has a DVI port), you will need an extra DVI-VGA adapter. One DVI-VGA adapter comes with the Mac Pro. Maybe you already have this.
I don't have any comment on the RAM. Never used that brand.
Regarding the video card, the standard Geforce 7300 should be fine to drive two CRTs. The card has two DVI ports. What type of port does the CRTs have? VGA? If they are both VGA (and neither has a DVI port), you will need an extra DVI-VGA adapter. One DVI-VGA adapter comes with the Mac Pro. Maybe you already have this.
I don't have any comment on the RAM. Never used that brand.