DIY LED seems to be significantly less expensive, while having access to nearly all the same tech as the proprietary models. Anyone with DIY skills should definitely look at LEDs.
What's your budget? Top of the line 50w COBs are around $25-30/USD. They require cooling, so they need a heat sink and usually at least one fan. Then you'll need to drive them, and there are a lot of options.
Cheaper options exist, though slightly less efficient. At least one mfg has COBs with built in drivers. They still need heat sinks and usually fans, but the wiring is as simple as soldering 2 wires of a plug to the chip. I personally picked up 1040w (actual watts) of full-spectrum and warm-white spectrum 30w and 50w COBS for $47.
Here's 540w's waiting for soldering, heat sinks and fans.