~£10 should be all you need to pay for a firewire PCI card. This should also include a 4 pin to 6 pin firewire cable. Normally the more expensive cards are exactly the same but tend to include some software. This is an good easy way to go as long as the software is good enough for what you want to do, but can often be a cut down (SE or LE) version. Buying the software separately can be a good idea as you have the option to try a few (most programs can be downloaded for a free 30 day trial from the makers web sites - do a search on the forum for links  ) to see what you like best.
Mark.
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Lexicon MC-8B. L/C/R: Blue Sky 6.5's, SL/SR/SBL/SBR: Blue Sky 5's, Sub: Velodyne DD-15
Panasonic NV-HS830, VTX-D800U via TiVo, Arcam DV29 & Sony BDP-S500 > Lumagen VisionHDP > Panasonic TH-46PZ85B. Marantz RC9200
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