I'll 3rd or 4th the XP2/T400CN films.(posted 8390 days ago)If you wish to develop yourself I've found that Ilfosol-S is a fine grain developer with good speed. I haven't compared it with some of the more esoteric developers but of the commonly available products (Kodak, Agfa, Ilford) it is an excellent compromise. I use it with HP5+ in 120 and expect Delta 400/TMAX 400 to have finer grain. I've just found that it is a ascorbic acid formulation (like Xtol) but I've never had the surprise expirations of Xtol.
Cheers,
Duane