u can try:

Denon C551
Klipsch Custom 1
Klipsch S4
Sherwood SE777

right now i have the Custom 1 and C551. but the Custom 1 purchased long time ago and spoiled already.
and i had a hard time choosing between C551, S4, and SE777.
because got really different sound signature. it took me a few hours at jaben.

in this case,u really have to listen for urself,according to ur songs preference.
the SE777 is the only BA driver if im not mistaken in this range.
i've tried all of the list u given except CrossRoad Quattro.
IMHO, Hippo VB and A-Jays 3 still a bit bassy for me. VB is warmer than A-Jays from what i've tried.
but VB can adjust the bass level.
the SE777 is the most bright in all of this list.

Klipsch Custom 1 and S4,the signature sound is almost the same. S4 has tighter bass than the Custom 1.
C551 is a bit bassy than those 2 300 range iem, S4 and SE777.
but still u can get the details after burn in.

this is just my point of view. u really have to try for urself at jaben bro.
make sure to bring ur own source and credit card for emergency. haha.

just my 0.0002 cent.

I went Jaben few month ago.  Tested a lot IEM, final decision SE777.  I like the smooth and balance of it.

congratulation!!! any promotion for the happiest day in your life?