I have the opportunity to get one of the two bikes. The 99 has a weighted flywheel which I will need as I ride woods, extra excel rims and renthal bars for about 1800. The 01 just has renthal bars and the rest is stock. I have heard about issues with the valves on pre-01 models. Is this true? Which bike is the better buy? Oh the 01 is for sale for about 2100.