Well, I see I'm a bit late to this thread, many things have already been said, so here's just a short summary of my experiences:
Fomapan 400: actually a quite nice film, BUT only exposed at its real speed, around 160 ASA in Rodinal and at most 250 in A49. If used at those speeds, I find the grain quite fine compared to other films of this class.
Fomapan T200: haven't used it enough to give a good, solid opinion; real speed seems to be around 125 ASA.
Fomapan 100: I like this one a lot (at 80 ASA in Rodinal 1+50) - looks very much like Agfa APX100.
The Fomapans do curl more than other films (but not as bad as Fortepan - with which they are often confused... - or Efke); the 120 size films have a weird turquoise base color, which does not have any negative effects, though. Fomapan negs look very thin compared to negs from other films - so DON'T increase dev. times before having tried printing/scanning them, even if they look thin, they work well. I have heard quite a few reports about problems with the T200 (damages in the emulsion, etc.), but have not had any myself.
If you want to use a film at around EI 400 or even higher, Ilford HP5+/Adox 400 is a good, inexpensive choice (as is TriX), since it has a realistic 400 in A49 (this dev. gives at least box speed with most films), and can be pushed quite well about 1 to 2 stops.
I like Neopan 400 a bit more (though the differences are only visible in direct comparison), but you have to be more carefully when pushing it, since highlights are rather easily blown already if slightly overdevelopped...
Roman