Nice collection dude.
Damn, Gok beat me to Silverbolt. Others I'd buy would be Megatron, TM2 Blackarachnia, TM2 Dinobot and TM Tarantulus. I'm saying this to show you would have buyers here.
But Gok is right, Don't sell if you think you'd regret it later. I've never sold a toy and the couple I've given away, first to my nephews (which I now very much regret) and my son (who I don't regret). In the end it's your choice.
I've spent a bit tracking things down after passing them up at retail. Thats not really comparable though.

Love the collection though. I see you have majority Transmetal stuff. Any reason for that?