Hi.
To OP, I think that the Epi T-bird is THE bass for rock both look- and tonewise. There's a several issues with the QC, but as always, the low price forgives a lot.
I'd personally still buy an used one, one that You can try before making the desicion. Chances are that an used bass that sells for 300$ new, won't cost too much used and as an additional bonus, should have the issues sorted out and in better playing condition than a brand new one.
If the Epi is not a must, the vintage Japanese Grecos', Orvilles' and such are said to be much better. I have no idea as those brands aren't common here in the northern Europe.
I still think that the Epi T-Bird is a good value bass and quite versatile too if You just spend a little time with the controls.
I own a Epiphone Thunderbird with a bad neck dive. How do you move the strap button fix it?
I did it like this, not the only way, but it's roughly in the same position now as in my Gibson Firebird. With a 3" strap it doesn't bother me at all.
First I drilled a pilot hole through the neck plate with a core diameter bit and then enlargened the hole in the neck plate with an OD sized bit.
Do install strap-locks when You're at it, saves a lot of grief later on.
Just my 0.02
Sam