I think it'll be James Haley, he's had a long spell at the club and pretty much been a constant in the team.

Penky must be in with a shout, Dave Larder perhaps?

A belated reply but i think this is about right. Apologies if i am not 100% accurate.Covers Seasons 1999-2011
James Haley 167+3 sub
Dave Larder 128+8 sub
Sean Penky 115+78 sub
Jim Gannon 115+7 sub
Jamie Bloem 114+33 sub

Penky made his 200th first team appearance for Halifax the other week at Sheffield.
He now has 202.
Damian Gibson made exactly 200 appearances in his two spells since 1998

Others by my reckoning to have made more than 100 apps as well as those listed above include Lee Paterson, Frank Watene and Ben Black. Dave Wrench finished in the 90's.

I think I remember Andy Hobson geting his 100 th apearance and thought he did a few after that.