I just traded my HUO FT a few weeks ago for credit towards a NIB Star Trek pro Vault and had to come up with $1900 cash out the door. I didn't exactly ask if that was with tax or exactly what he was giving me towards credit but they had the ST listed at $5600 on their website so if it's just that then $3700 in credit but if it was plus tax tag and title figure a little over 4k for credit.
I had it listed on Pinside for a few months at $4500. A friend of mine sold his FT about 8 month's ago and got $4500 for his. I know the guy that I got mine from paid $3850 for it. So high 3's to mid to high 4's if you find the right buyer right now.
FT is definitely a fun game I really enjoyed it but was always scared to play it just cause you never knew but FT seemed a lot more reliable than Alien does. I was only 1k into my FT as I traded a Pacma Smash for it so up trade for me.