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Frankly speaking, you dont need to buy any hard disk that performs faster than the bus can handle. I think you wasted your money if your old rig is sata II and you ran a q9550. To put a better spin on your situation tho, I look forward to your future motherboard/proc/memory upgrade to match your current upgrades.
Upgrades are always a positive and im sure it will perform better than your pre-upgrade rig.
As far as issues when cloning from a HDD to a SSD, use Macrium Reflect free edition to clone it.
By the way, did you upgrade your power supply or what is it?