Is it okay for me to pick the ring?

I am getting married and I am wondering if it is okay for me to pick the ring..(I am the female) and if so, should there be stipulations, such as price...I love him, and don't really care WHAT the ring looks like, I just want to show him that I am excited, and I REALLY AM very excited...but do you think it would be insulting for me to pick out some rings that I like or should I just let him handle it? He said I could e-mail some ideas to him, but I don't know if that is improper or what...? Any ideas? And is it asking too much for me to want him to wear a ring too?