We have a "Miss Kim" lilac bush. It's a very nice plant, and I love the smell!! We actually had one already in our yard when we bought our house. We transplanted it to another location, but it didn't survive the transplant. So, we replaced it. I don't remember how much it cost to buy another one, but I know it wasn't outrageous or anything. I'm not sure what your soil is like where you live. We have really horrible "clay" soil, and the Miss Kim that we have seems to be doing pretty well in spite of that. As far as size goes, I don't remember how big the Miss Kim gets (ours is still somewhat small after 3 years), but it is definitely a bush not a tree.