The original lilacs, often found around old houses, have been greatly improved over the years. There are even some varieties that will bloom a second time in later summer (they might say they bloom all summer like roses, but that's an exaggeration). The variety I've used the most is called "Miss Kim". It's "dwarf", but I've seen them taller than 6 ft over time. What I like about them is they are absolutely covered with blooms and the fragrance is pure lilac and seems much stronger and longer lasting. They are not new and so pretty cheap at the discount garden centers. BTW, if you go to Shady Maple, allow time to explore some of the local nurseries and greenhouses. Quality is higher and prices much lower than other places. I think it's all the local competition or something.