I know that there are a number of Macbook enthusiasts here, so maybe some one could give me some advice. I have a standard 13" Macbook Pro, which is approx 16 months old. I'm considering what would be the best for an upgrade; more RAM (8Gb) or an SSD, or both, or sell it and buy the latest? Mine is the following spec:

Hardware Overview:

Model Name: MacBook Pro
Model Identifier: MacBookPro7,1
Processor Name: Intel Core 2 Duo
Processor Speed: 2.4 GHz
Number Of Processors: 1
Total Number Of Cores: 2
L2 Cache: 3 MB
Memory: 4 GB
Bus Speed: 1.07 GHz
Boot ROM Version: MBP71.0039.B0B

Is there something really useful that I should be doing?
SMC Version (system): 1.62f6