I think it's fine to say and let the counter party realize that various factors and details may affect the actual rate, but another to do this is to still state

I think it's fine to say and let the counter party realize that various factors and details may affect the actual rate, but another to do this is to still state a single rate and qualifying it with a statement that lets the counterparty know that it is still negotiable. Because sometimes giving a range I feel is almost giving off as a sign that I'm not confident in negotiation process and I don't exactly know where to place the counterparty.