Norty is spot on with the number of heads vs angle, two sharpie copies or two second hand mac 250 Entours, the macs will get the vote every time. Don't get obsessed with newer is better. I still have a big stock of Goldenscan 3's which still look amazing, still reliable and due to their speed can outperform any head, you just need to be more creative due to been limited to 180 deg.
Elation plat 5's are not bad but we use Stagg Hyperions and have not had an issue with any of them, plus parts and support are UK based.
Colour Imagination (hk) are brilliant and we have had no problem with spares.
lighting the way since 89