Hi Kelvin. Not sure what you are looking for when you say reliability and useage. The camera is just a tool and to get good results the operator has to play his part too. When you are shooting events you have to get the shot first time, every time. When you are making a movie this is not really the highest priority.
When shooting a film, even low budget, you will have time to set up every shot. For DV, you will get better images with an XL2 or DVX compared to PD-150. The XL2 standard lens is pretty long though, so you would probably need a wide angle converter or a wide angle lens for most shots, especially indoors.
For HDV, I have used a Canon XH-A1 alongside an XL-H1 and they match fairly well. The H1 has an advantage in being able to take the Canon 6X wide angle lens, but of course it is a much more expensive package when you add up the camera+lens.
I believe though that you could probably get great results from any of the decent HDV cams available on the market. Your film will not be made or broken by the choice of camera. The shot composition and lighting are much more important, and of course you need good actors and a good script otherwise the best cam in the world will not make your movie work.
Maybe you could share something about what you are planning to shoot? I'm sure there are experienced people on this forum that could give better advice if you could be a bit more specific.