OK, I didn't read the other responses before responding, so if I repeat, please bear with me....
We have 4 harnesses, and 2 double ended dongs.
Our first was a double ended one, and it was the Feeldoe, which is a little over $100, but it was what he wanted to try, and since it was HIS idea, for being inside of HIM, it was worth the risk. Besides, if he didn't like it, I could use it as a dildo!
I would suggest that, if you are going to get one, let money be no object. You can find good double dongs, or strap ons for under $50.
However, let me say that simple is better. Don't try to go for one with a remote, or corded bullet, because those are more expensive, and they also add a degree of difficulty for a first-time user. Get the feel for them (which, BTW, I didn't think it would be, but I felt powerful AND sexy the first time I put mine on)!
My first harness/strap on was called the Double Delight. And it's very comfy, adjustable, and we both liked it a lot. It's still our "ole faithful". And it was under $50.