This is difficult to answer since it depends on what you're looking for and what sort of budget you have. Since you're in a colder climate, you might want to start off with a large plant if it's in your budget. Jon ("pitangadiego") runs Encanto Farms Nursery in San Diego and has many large plants. I bought some 5 gallon plants when I was there in June 2008 and some gave pups within a month or so. Shipping for larger plants would be higher, but it might be worth it for you. Look at the bottom of
ENCANTO FARMS NURSERY Available plants. Also, I am quite sure you'll know for sure what you're getting when you buy a plant from Jon as these are all from plants he's been growing himself for some time.