You have to remove the alternator / PS pump which necessitates removal of the accessory belts and deflection pulley. If these haven't been replaced, they may be in need (and they are relatively cheap). At least for the belts, you can inspect them before you start to decide if you want to source new parts. Similarly, with the VANOS oil line, you can tell if it is weeping at the crimps before you start. Other than that, the PS suction hose often leaks, now would be a good time to replace that. There is a plethora of maintenance items right there. However, most - if not all - of them aren't as deep as the OFHG. So pick and choose what you can afford / needs to be addressed now and don't stress over the rest. Chances are, while you're in there you'll find new projects to be added to the list.