Personally, I'd buy full bodied coilovers WITH adjustable dampening. The full bodied gives you full shock travel and the adjustable dampening gives you more or less rebound (ride like a shopping cart, or ride like a Cadillac).
Most set ups I've had with strets and coilover sleeves haven't been half as comfortable as full bodied ones, although they've been cheaper for the most part.
Also you could consider buying lowering springs, as long as you're not worried about riding a certain height and not be able to change the ride height (also stock shocks will wear out faster this way).
Lost of options, researching is always a good start.