Liam, opinions are like elbows...everyone got one...I guess I do too. I'll share mine based upon what I do professionally - which requires I use a headlamp almost daily as well as in my recreational activites which are almost always woods/wild related.
As part of my business we sell headlamps (no not a sales pitch just a few insights). We only sell what we use ourselves in the nature of our work. Anyway, after going thru many-many hours on field excursions in various extreme weather and atmospheric conditions, plus training and attending wild classes, and other sundry trips using headlamps...and we have one staff member who tests gear for Petzel we now only sell the Petzel Tac Tikka Plus. It is used by the US Army Rangers in the sand box for their missions. They do some really cool things with these lamps for night ops LZ deployment. Rugged, durable, lightweight relative to functionality. This is a mighty fine hard core, battle proven, tough environment headlamp that would serve you well.
HOWEVER, because we're constantly testing new gear we've chosen to now start to phase out the Tac Tikka's (even tho their awesome headlamps) and now are exclusively stocking the Princeton Tec Quad Tactical Headlamp. I'm now slowly converting over to them exclusively for my own household...here's why we only sell them and really think they're the "thing!" They are built to rugged Mil Spec standards (bombproof), are H20 proof down to 1 meter for 30 minutes, will run on alkaline, Lithium, and rechargeable AAA batts. The battery compartment is secured with a thumb screw that can be tightened by hand and also with a screwdriver that is built in and attached to the headband (nice feature). The lamp has four regulated LED lamps with a low, med, bright, and flasher and has the RED cover for night sight preservation. The lamp rotates a full 90 degrees so you can work with your hands up close and not have to contort your head to adjust the light. The best part is it is a Regulated which means as the batteries begin to die the lamp does not get dimmer like traditional lighting but rather maintains the same brightness as the batteries loose their strength.
I only buy hardcore, bombproof gear for the business and for myself...but everyone has a different purpose and mission. For our business and my lifestyle this is the way to go until something better comes along. The Petzel is going to cost a bit more whereas the PT Quad Tactical is a bargain and very affordable!