Replying to Nikon to Canon? not the usual questions

Hey so i have a nikon d300s and it kicks ass for photography but i am looking for more on the video side.... (lack of any fps besides 24... and only 720) so i am selling my vixi a and nikon d80 to hopefully eventually get a canon t2i but i don't want to buy a whole new collection of lenses and i have heard a lot about converters but i am a little considered because a lot of people complain about not being able to get them off their lenses. so does anyone have anything to say about a way that i can use my nikon lenses on my canon but be able to easily switch them back and forth because i plan on using the 2 cameras equally. thanks +k