If your looking for an effective solo character, there are several Druid specs that will allow you to solo effectively. Druids are depended upon to heal in RvR tho, and you will be watching the action more than involved in it. Some players like that aspect more, and some don't.
I personally enjoy rangers and nightshades. Rangers are a pretty effective solo class although their arrows can be expensive. I have really enjoyed my Nightshade in RvR, and I can solo fairly well as long as I play smart. Unfortunatly both of these classes are the least wanted for groups, so that will be frustrating for you from about 35-50 or so.
Much of it depends on your playstyle. What server are you starting off on? If you start on Igraine I can help you get started with money and items from our guild.