Well yes, When ever I use plug in 5 suite and Topaz, I get this memory error but like you said, if the CS5 will solve this problem then it is only a matter of few days to wait and see!
Maybe it's a Topaz error then. If it's the case, you may still have problems with CS5. Go to their website: they probably talk about CS5 compatibility with their plug-ins.
I am sorry but what does SSD means? (sorry I hardly know anything technically in computer a specially in hardware).
A SSD is a Solid State Drive. To make a long story short, SSD are very small drives for your computer that are very different from regular hard drives. Their specifications make them perfect for a boot drive (the drive where OS X is located). Most people buy SSD in the 50GB to 160GB range, with the Intel 80GB as one of the favourites.
Suppose if I change my boot drive in to 1.5 TB would you reckon it will help? because my 1.5TB Seagate 7200 will arrive in next 5 days.
As someone else said, going to a 1.5TB drive would help with general performance very slightly. But remember that with 16GB of RAM, the size and speed of your hard drive won't have any impact on your photoshop performance. Getting a SSD for your boot drive will make your overall Mac experience faster (opening windows, boot times, application starting time), but it will not speed photoshop up.
tell you the truth I don't even know how to transfer all data from one drive to the new one!! I guess you simply drag and drop in to new drive and then delete all from old one??
You can use this simple method for drives that do NOT contain OS X (the Applications, Library, System and Users) folders. If you want to copy a drive that has OS X on it, you should use some dedicated applications like Carbon Copy Cloner. The application works very well and is free.
I usually switch off every night from from shut down menu.
As others have suggested, you can put your computer to sleep. You'll find that option right above the "shut down" option in the Apple menu. In sleep mode, the computer doesn't do anything, uses only a very very small mount of electricity, and will "wake up" in a matter of seconds as soon as you touch your keyboard or mouse buttons.
Clean My Mac gives me approx. 400MB every time I clean it. in last 3 months I have regain approx. 500GB according to it shows me on screen.
I'm not a big fan of system cleaning apps. Actually I never use them and my computer is always in top shape. OS X runs a lot of maintenance tasks in the background and for me it's good enough.
You must also know that this 500GB is a huge amount, but that it's the sum of cleaning the same cache/temporary files over and over again. Not running the app will not result in 500GB of lost space!
At present my File vault is off, is that how it supposed to be?
That's up to you. I don't advise it for photoshop usage. File Vault is designed to protect your data in case of theft, so it's a lot more useful for laptops that you carry around. If you Mac Pro is in a public or easily accessible location, you could consider activating FileVault if total privacy is important for you. Know that it will slowdown your Mac.
My Mac Pro is in my house and I've never activated FileVault.
My fire wall is also off at present.
Same with mine: I've never used a Firewall on a Mac. Then again, I'm using my very own private network in my house, and my router is protected. If your internet connection is shared or public, it "may" be a good idea to activate it.
Many people disagree on the subject of the usefulness of firewalls on Mac computers. It's up to you.
Loa