Formal:
* J'aimerais beaucoup vous rencontrer. (This is the most formal way to say it, and it is appropriate for someone you don't know well or for a professional setting.)
Informal:
* J'adorerais te rencontrer. (This is a more informal way to say it, and it is appropriate for someone you know well.)
* J'ai vraiment envie de te rencontrer. (This means "I really want to meet you," and it is a more casual and enthusiastic way to say it.)
You can also add a little more context to your phrase:
* J'aimerais beaucoup vous rencontrer pour discuter de… (I would love to meet you to discuss…)
* J'adorerais te rencontrer pour prendre un café. (I would love to meet you for coffee.)
Here are some additional tips:
* If you're writing to someone you don't know well, it's always best to be polite and use the formal form.
* If you're speaking to someone you know well, you can use the informal form.
* You can also use the phrase "avec plaisir" (with pleasure) after your sentence to show that you are genuinely interested in meeting them.
No matter which phrase you choose, be sure to say it with a smile!