I faced a similar dilema about a year ago...rising costs of Tri-X...what to do? I looked at a few alternatives. Classic Pan 400 (aka fortepan 400), HP5+, ADOX CHM400 (aka HP5+). These are all good films in their own right but, none of them is Tri-X. To my eye, HP5+ has a look very distinct from Tri-X. It is a great film but, again it's not tri-x nor is it any cheaper really. Classic Pan 400 looks nothing like the new Tri-X but is much cheaper. It too is a nice film. It does take some getting used to for some reason. Ryuji mentiones Neopan 400...I suspect the same truth applies...It is a fantastic film but, it isn't Tri-X and it really is no cheaper.
In the end, I came back to Tri-X.