Your posting is already a month old but I thought I'd drop you a note just in case. We might have corresponded about this pen some time ago, but I don't recall for certain.
I have an NOS Lamy 2000 with box. I don't recall the nib size so if you're interested let me know and I'll dig the pen out to check. As it's new and unused, I can't vouch for the ink flow but that's fairly easy to adjust in any case.
The pen in here in California. Asking $150, essentially MSRP.
Please be in touch if you're interested.