Really just depends on how much you want to spend. To me a headset will always be a 'disposable' part- They are just cups and bearings and for that I don't like paying loads when something costing £20 will do the job perfectly for a few years by which time I'll change the frame and just get a new one. First thing, King's aren't steel. They're available in steel (and titanium for the ultra bling) but the standard NoThreadSet in the pretty colours are all alloy. King's are brilliantly made bits of kit, but for to machined cups and a set of bearings at the end of the day you're primarily paying for the name. I got one for 'free' (insurance claim), but sold it with my python frame as it was green and bought a C2 instead. Couldnt tell the difference in function. For me pigs are also just too overbuilt. I used to run one in my BMX and it's a good, solid piece... but for trials that's just overkill. I've used a Cane Creek C2 in the past and found it perfectly usable- very light and functional and am currently using an FSA Orbit Equipe on my Inspired which at £22 is bargainous for what seems to be a really well put together, solid headset. Your call at the end of the day... if you're after 'quality', don't forget the Tensile and Hope units, although both seem to have quite a big stack height also.