North Wales is beautiful on a dry summers day. Not sure where you live, but knowing the wet weather conditions, maybe dirty rural roads, with lots of twisty bends, having been to Wales many times, my 'scientific' method would suggest that you buy a Triumph Street Triple, BMW G650, Kawasaki ER-6, Ducati 696 Monster or Honda CB600F Hornet.

Nothing really wrong with Harleys so long as you try to keep to the usable, less raked out, lighter models, that can take some lean with out grinding bits too much, that would be more scientific.

Just never become a snob!