I'd go with quantum boards all the way.. I have one myself (not used in any grow diary though) and they're insanely bright and effective..
look at the ones from Kingbrite on Alibaba, they're known to be original Samsung lm310's and are around 180 with shipping from China and you can get the 240w model with original meanwell drivers, Samsung lm301h and 660nm red and if wanted also with UV and IR and all dimmable, which is perfect for a 120x60 for all stages.
..another option from Alibaba (and maybe even better quality, at least when it comes to the size of the heatsinks) are the ones from Meijiu (also original Samsung LEDs and meanwell drivers, but to my understanding no IR or UV switch), but they ask more for the shipping, so you'd end up with around 210 US.
The quantum board I have is a 240w model, but bought locally, so i paid around 320 Euro for it (will go via Alibaba in future though) and it's insanely bright when turned all the way up. I don't have it in my growboxes (so there's no grow diary with it yet), but i'm thinking of getting another one for my 60x60 tent because they're so amazing.
I just sent a message to Meijiu last night and they already responded (the offer was 212 US with shipping to Europe for the 240w model). Kingbrite has been rather slow in responding to me.