I'm only really know the Tees area so here are my suggestion:

New single deckers (ADL Enviro 200mmc seems the best shout) for new 'Express lines' operating on X26/X27, X66/X67 and X3/X4. Streetlites to go on less demanding work (probably the 15). Omnicities to replace the smaller Centros at Stockton and would have a brief spell at Redcar to finish off Temsa refurbs.