Unfortunately a program like Logic always has the capacity to max out any computer - just and more tracks and plugins, and you'll eventually hit the ceiling. An SSD that you can migrate to your next laptop is worthwhile, but I would hold off buying more RAM and instead put the money toward a newer machine.
But honestly unless you're not using many plugins, your 2GHZ processor is going to become a serious bottleneck.
Stock laptop hard drives are relatively slow, so an SSD will help you and may be the best upgrade for a small amount of money, because Logic needs to write to disk as quickly as possible, the more tracks you are recording at once.
With Logic, it's all about RAM, hard drive, and processor.