flathead needs more bk's of any model. im so tired of indigo after so many years.
Your desired fits are different. You say you want a slim/straight jean and a fit, but also say you want a New Cure fit.
If you want the former, go for a XXX1 cut (1001, 3001, 4001BK, 5001, S5001) or the F310.
If you desire the latter (which is actually a slim tapered fit, not slim straight), go with the BSP's.