I heartily agree with Snickersnee! You can't go wrong with Jim Keating and Comtech. Their videos are well done and conceptual in nature allowing you to adapt and grow in whichever system (Western or Asian) suits you. I'd recommend both. Mr Keating has real world credentials, is an effective teacher, and stresses the responsible use of the blade in all situations.
You can probably get functionally effective quicker with the American Blade Concepts series - WMA. The Western systems are more point oriented with the idea being to deliver a strike without receiving one yourself, while the Asian systems favor more slashing and moving in closer. If you are into Bowies, such as the Bagwell Hell's Belle, then the ABC series is a "must have". At least Vols.1-3. They'll take you from the thrust, through the defensive and offensive flows, to the very effective backcut that made the Bowie such an awesome weapon.
If you get a chance to attend one of Mr. Keatings seminars or the Riddle of Steel, don't hesitate - they fill up fast. First Rate!
Mike