IMHO you can't go wrong with TXP or FP-4+, though if you're bent on "slow" and "kodak" then you have a choice of TMX or.....TMX. I don't know how TMX compares with it's faster sister TMY, but TMY is really quite nice to work with. IIRC, John Sexton has written extensively on TMX and he certainly does fine work with it so you might want to check into what he advocates. If you really want slow, you might look into Efke 25 (the panchro, not the ortho version.)

Cheers!