I would like to recommend you go to your local pen shop/stationers, write with various models and then order your selection (or at least get a price from)
www.bromfieldpenshop.com. They are located in Boston, not too far from Harvard's campus and have an incredible collection of brands and hard-to-find items. I recently acquired my new Mont Blanc bordeaux rollerball there (authorized Mont Blanc dealer) which has been out of production for at least a couple years. More importantly, I have not found better prices anywhere, and if you do, they will match it and have free shipping. Check it out.