I like deep vibrations also. I do enjoy patterns, but if the toy is a quality one with no patterns and I have to choose that over something of less quality that has patterns I'll get the better quality toy. I also like a shaft that can reach the g-spot. Sometimes I feel like I dont even consider many toys unless they can.
Oh, definitely deep, rumbly vibes! Also, I prefer rechargeable silicone vibes, though I'd definitely be up for trying a metal vibe (like the Little Chroma, Little Steel, Little Gold, or Little Platinum).
Non-buzzy vibrations are the most important feature, followed by material safety. Everything else is negotiable. However, attractive features include: either rechargeable itself, or compatible with rechargeable batteries; waterproof or at least splashproof, for easier cleaning; multiple speeds and patterns; and durability.