Well, if you don't mind the outrageous cost per GB and it not affecting how fast you surf the web, do email, write Word docs or Excel spreadsheets, etc., sure, get an SSD.
With the OP's computer, a large 7200 RPM HD is a better use of money, else he's better off getting a newer laptop.
Wait, wait, wait.... A new computer or HDD doesn't improve speed either for surfing or writing etc...