Hello, you have options. You can replace the motor and clean the screen below it which should give you the power you have lost over the years. Also, a newer hose will deliver a lot more power. Older ones get tiny holes that equate to loss of suction and there airflow characteristics are poor. But if you want to replace the unit you can. There is no end to the possibilities. The latest units have incredible suction and run at 15 amps. The best of those is the SilentMaster S44 which you can gaze on here http://builtinvacuum.com/products.html
. The AirMaster C300 is similiar to what you have now, it is bottom emptying. But we encourage disposable bag filter units such as the SilentMaster. Please call us for more information.