Depending on your view of reasonable…

The Pilot Metropolitan for around 25.00. Anything from Twsbi for 50-100.00.  the Platinum Century for the 100-250.00 range. The Pilot Custom 823 for the 250-500.00

The nice thing about fountain pens, is just like watches, you can get really good ones for reasonable money. 

Fountain pens. Another form of useful art. 

I have the Longines Hydro Conquest, and can’t say enough good things about it.