from that list you could buy Ilford LC29 (I use this regularly.. not sure why they list Plus seperately I believe LC29 is Plus, it was called Plus here until recently now it's labelled LC29, but since they charge less for Plus, get that instead ), or Rodinal. Both are economical as you dilute them considerably and both a liquid concentrates which makes life easy to start with.
For Film, Delta would be fine, but I'd suggest FP4+ (125iso) & HP5+ (400iso) to start with. Grab a couple of each and see what you like.
Also grab some (250ml) of the Ilford Wetting Agent (similar to Photoflo) if you haven't got any Photoflo or equivalent. I like spending other peoples cash