If you like the Viper and want a "Viper+", it's the Diamondback Scout. The DBS has 2 more utility points and pretty much double the jump range. It's slightly slower under normal power but slightly faster boosting, and is so much more maneuverable. It's also very good at silent running, which can be a very useful tool in combat.
The Vulture is great but it's a different animal. A really, really boring one to fly.
EDIT: I see you're tempted by the Courier. You can't go wrong with that ship either, it's great, and very different from the Viper in a good way.