Best way to improve performance?

I'm using a Dual Core Intel Xeon and starting to do video work on it with Final Cut Pro, etc.
I've got 8GB of DDR2 FB-DIMM at 667MHz.
I'm using a Cinema HD display, driven by a NVIDIA GeForce 7300 GT.
What would be your best advice at improving performance (if there is any). I doubt more RAM would help; not sure if there is anything faster than 667Mhz for this machine; Could a newer video card help rendering speed?
I'm generally very happy with how things work, can't afford a new MacPro, and am simply wondering if I should invest in something more affordable that could give me a slightly better kick?
Many thanks,
Czet

One thing that's always useful is to make sure you've got iStat installed and see how much of your RAM is actually being used because 8Gb is a lot, even for HD but it doesn't rule out a lack of RAM.
The 'biggest' increase in speed I've ever seen on any of my kit was a SSD. I've setup my Mac Pro with 2 x 128Gb SSD in the 2nd optical bay (in a 3.5" RAID 0 caddy) and setup Final Cut Pro to use 2 x 1.5Tb Seagate 7200.4's in software RAID 0 and everything flies. A 256Gb SSD is far more expensive (and slower) than 2 x 128Gb's in a RAID 0 caddy so a no brainer.
Graphics cards always help but in my experience the only place you'll notice significant improvements are Games and software such as Motion/Aperture where you really must have a decent card.

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