The next best time to have your tool overhauled is when it is in need of repair. If there are plenty of pads which want to get replaced, several more will likely are looking to be replaced in the near future anyway. If keys are bent or if spring tensions are off, it is more inexpensive in the long run to have every thing fixed without delay. Normal upkeep are done by the hour, and if much work has to be done the price can quickly surpass the flat rate of an overhaul. Additionally, cork pads fitted during an overhaul will last almost indefinitely. This means that the feel and playing condition of the device will endure much longer, costing the player less in maintenance ultimately. The best of these brands are Yamaha, Leblanc, Selmer, and Buffet. Any of those brands are fine for a primary, plastic clarinet. Plastic clarinets are ideal both for newbies and for marching band, because they are able to take a beating or the outside climate they will be subjected to. Purchase your clarinet new if at all possible. If it is not feasible, have a certified play test the tool and play situation it before you pay for it and take it home.