Dear Folks - I've had my GS300SE (2005) for a while, and have been very happy with it. I've agreed to part-ex it at a Main Dealer for a GS450hSE-L (June 2010 model with all the extras and 32k miles) with a £17K balance to pay. Am I being rash? Will I notice a big difference (apart from the hole in my bank balance)? I'd appreciate your thoughts as current owners...