Nice item - SW figure proofs are going crazy and I don't think you could hope to pick one up for under £1500 now (and that's for a crappy 21bk character) - 12bks are way more.
Your TIE has a bit smaller market I think, although I'd be amazed if you didn't get £500 pretty easily (about what revenge proofs seem to be getting). I'm not sure I'd pay much more than that, but wouldn't rule out someone doing so.