Dry Suits: Extending My Season

As i grow more and more attached to this sport i am needing to extend my season past the warm summer months. I believe that a drysuit will be nessecary to do this but i have no clue which brands are high quality drysuit brands and where to buy them at. I know there are web sites but i need some first hand advice because i definitly want a nice suit not a cheap leaky one. So which suits do you use and where did you pick them up at? Thanks