Sadly, I'm not a resident of the States, so obtaining any of those pens would be a bit of a pain :P
I came across a few Lamy pens, and while I found their appearance to be a bit... outre, they were rather fine to write with. And I agree with that comment about modern Sheaffers being a bit... difficult. Luckily for me, the attendants over at my local bookstore were more than willing to let me try out their products in-store. I was a bit shy to ask if I could try the 30,000 peso (around 700 USD?) Parker pen, though )
The Namiki Falcon is excellent, I think, though the price is a bit intimidating for someone new to fountain pens (re-living my first few days here on Head-Fi, I think XD); I'm going to see if I can pick one up second-hand, but in relatively good condition.
Anyway, what vintage pens (ones that are still easy to obtain) would you recommend? I'd prefer one with a converter, if at all possible. Thanks!
In that case ebay is your best friend! And I would recommend vintage everyday over modern at lower price points as long as, as has been said, it has been restored. I picked up a fully restored Parker 51 Vacumatic made in 1944 from a reputable seller on ebay a few weeks ago, an absolutely wonderful pen and having been restored it will unlikely need another restoration in my lifetime.
The advantage with the vintage pens are numerous, firstly the quality of nib is far superior to most modern nibs, secondly it feels great to write with a bit of history and thirdly the chances of finding a really nice flex nib are much higher!
This seller in the UK is well known on the forums, has a youtube channel showing his restorations and has some beautiful pens ready to write with, here is a link to one that is a beauty and in your budget!