There’s a lively exchange going on over at Vox Daily regarding the merits and demerits of doing voiceover work under union contacts exclusively. You might want to join the discussion.
I should point out that there’s a lot of confusion about the term “financial core” floating around, some of it in the comment thread of the above post. You’ll find some good, hopefully clear, examination on that issue of you search the archives here and at the VO-BB.