Mac Pro Quad core Intel Xeon upgrade advice please!

Hi all, i have a Mac Pro Quad core 2 x 2.8ghz Intel Xeon (2008 model) with 4gb RAM.
I am planning on giving it some upgrades and a fresh OS install as it is slowly grinding to a halt (particualrly noisey hard drives)
Can anyone recommend best/fastest/silent! S-ATA hard drive to upgrade to?
Can anyone recommend a good replacement ATAPI DL DVD-RW Drive as mine is also on its way out.
Ram upgrade. Lots of space for RAM so what would you all recommend?
Ultimately i am finding myself working with alot of large PS file and so would welcome any suggestions to improve/soup-up the processor/performance.
Thanks for any advice in advance...

24GB RAM gets cost ly when you look at 800MHz FBDIMMs in 2x4GB
You shoudl have added more as 4GB is vary basic and miinimal
Any SATA drive device is fine. WD Black 1-2-4TB / WD 10K VRs are fast but not as quiet though I do hear those WD Blacks.
A single SSD for a system is nice.
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Your GPU most  probably is in need of an upgrade.
You should never need to do a reinstall of the OS. Clone. Yes. And start wit h a new OS by not upgrade in place over the old OS but that is when to clean install, clone and use Set up Assis tant.

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    L3 Cache: 8 MB 
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