I mean, covering several strands just on that specific 100 club weekend on the Friday in the Manchester/Leeds area - and these are just the ones I've visited; I can't comment on the others:
Burnley is the best event (IMNSHO), intimate and atmospheric with more adventurous music.
Brighouse is a great representative of the popular oldies scene. Good atmosphere, normally very busy.
Beat Boutique in Manchester - young and vibrant crowd, but more of a nightclub thing with some good young dancers and a fresh NS-centred sound, but lacking the dancefloor discipline that's an important part of the NS culture. But good copy.
The biggest nights in the country that weekend (I think) will be Stoke Kings Hall on Saturday (is that the North of England, though?); Brighouse on the Friday.
I haven't yet been to the 100 Club, but I would have thought Stoke/Burnley would be more representative of what its all about from a journalistic perspective, and a better combination for a visit if restricted to that weekend.