My first Tantus toy was the Vamp. I went with it because I loved the way it looked, it had great reviews, and was reasonably priced. I still like it, though sometimes I find it a little too firm.
Congratulations on your first Tantus toy! They are a fantastic company and have such high quality toys. I actually want the Mark as well! I have the O2 Cush and love the extra give it has vs. regular Tantus silicone.