Hi guys i need some help, what Boost Controller should i get what one would be best for the job

i was looking at geting the Greddy Profec E-O1.
as im geting the Greddy E-manage to start of with

as the Fcon-s or Fcon-Pro will have to wait as i would like to get it up and runing 1st before i go paying £500+ for one of them
if there is any thing out there that you guys think is better please let me know, i have went for the Greddy to keep the Price down, but what do you guys think,
Thanks marcus