I use Dixactol Ultra for 90% of all my Monochrome work, films used are Ilford Delta 100 & 400,HP5+ and FP4+ and am very happy with the results.
I have also just tried first two rolls of Fuji Acros 100 and I think this may be the best.
Dixactol data can be obtained from Barry Thorntons web site


hope this info is of use to you