Hi there,
I would think it may matter if you plan on doing many different HD streams and some more advanced editing.
However, if you are thinking of getting a raid card then you may likely have the budget for what I am about to suggest. Plan for growth right?!
Get a Caldigit Raid Card for $550. Get 4 drives and put them in raid 5. I used the WD640’s from newegg and they give me a standalone speed of over 100 MB/s read/write and they are only 7200! Using the Apple raid card I get a Raid 5 array that does 200 MB/s. The arraid totals 1.5 GB of usable space and the drives are about $80 each.
Then, I installed a velociraptor in the second optical bay and used 1 of the 2 internal SATA ports to hook it up. You can’t use boot camp with it like this but you can select it as your boot drive. We use Carbon Copy Cloner to copy the current install of the os to the velociraptor, however we did this when it was fresh and you may have more than 300 GB already. I am sure you can figure that part out.
Now you have a Raid 5 array with a Velociraptor drive.
To do this you need the following:
Velociraptor – $300
Drive bay adapter – $40
Right angle sata cable (normal works to but it bends at a right angle in the end) – $??
Molex power adapter to Sata power (not sure of the proper name) – $??
We just installed the Caldigit raid card on another graphics computer that will probably be doing video in the future. I am using that apple card on the main computer, good enough for my SD stuff right now, but when we upgrade to a Panasonic HD then I may change it over.
We then use a BlacX hardrive dock (usb 2.0+eSata) to do time machine backups of what we want. That way you can disconnect the HD from the dock at the end of the day and put it in a mediasafe (protection from fire) or take it offsite in your backpack.
Hope this helps.