I think you would be better off with a DB Scout or a Courier (latter even better, if you have the ranking or a PP ranking with Empire). To build a proficient Vulture, you need at least 15 million. Trust me, I made the mistake months ago buying the Vulture upgraded from a Viper with 10 million, and it was direly underpowered in every respect.
With a DBS or a Courier, you can spend 5 to 10 million respectively for an A class ship, and definitely mull out millions with each run in an RES. The DBS is quite a fun ship. Despite having an FDL and a Clipper fully loaded out, I tend to keep a DS to wing with my son in RES instances, and it truly is a very proficient ship. If you are a capable commander when it comes to combat and dog-fighting, with a DS you can easily take down a Clipper or a Python in PvE RES instance without either ship getting a shot off at you with proper positioning.
I would wait until you have the requisite 15 million and then invest into a Vulture, just make sure you have sufficient funds for the insurance in case something goes, well, really wrong.
Let me know if you need help with the DS or Courier buildouts and I will be happy to offer a few.