I like the Kaweco Sport ink roller pen (a.k.a. rollerball pen). This pen is refillable (it accepts standard international short cartridges), so I can choose what ink I put into it. Currently, mine has Platinum Carbon ink, which is a basically India ink without shellac or acrylic, and the pen-ink pairing works wonderfully.
The Kaweco Sport pen is available at some fountain pen retailers that handle lower-end pens. Online ones I know of are Writers Bloc
and Swisher Pens