OCX Vertex range doesnt seem to perform as well as the V2 or Vertex range despite quoted specifications. Id recommend:

OCZ Core Series V2 SATA II 2.5" SSD
http://www.ocztechnology.com/product...ata_ii_2_5-ssd

or
OCZ Vertex Series SATA II 2.5" SSD
http://www.ocztechnology.com/product...ata_ii_2_5-ssd

I manufacture a Drive Sled which allows you to fit a 2.5in SSD in a MacPro. Link shows v1: http://gallery.mac.com/simonpugsley#...lack&view=grid
v2 will be available in May and is re-designed to support 2.5in drive connection to raid cards, or as a spare 3.5in drive sled - contact me directly for a quote.

Dont use SATA.

Nvidia 8800GT has 2 x DVI Dual-Link ports. There are some other Mac compatible ATI cards on the market, but they are not officially 'supported' by apple.
http://store.apple.com/us/product/MB137Z/A

Try and get the TH2G-Digital edition. It will give you more resolution options and will work in both Analogue or Digital modes. It is also tried and tested with the Nvidia 8800GT card

Simon