HP5 user here and had the same dilemma... the other way around (slower film). Grabbed a brick of Delta 100.
As I'm not a quantity user, HC110 is a great developer and mostly soup using Dilution E, exposing at 320.
On sunny days I often use a Yellow filter (#12), rating at 160.
TMY, I am also intrigued by that film. A particular feature I think about is its lesser spectral sensitivity on blue, which should show up as if a mild yellow filter were used on another Pan film.
However, haven't tried it.
HP5 is very solid. Prints straight and easy, sometimes it's a bit flat (or my skills are and I have to train myself more). My choice, somehow finding myself like what Ian Grant mentions. Quite available and in Europe it's priced at a very reasonable range and often 1€ cheaper than Kodak film, significant for my student budget.