The binning is very important, controlling the output spectrum and overall efficiency. The newest tech LEDs are made with ceramic backing, which means they'll take over 10 years to lose 10% efficiency.
The bargain LED's are not ceramic backed and will lose upwards of 30% efficiency, in less than 10 years.
The best bang for your buck right now in LED is DIY. Basic construction, soldering, electrical safety and math skills.
You can build a premium quality light for close to $1/watt. This means a 330w light will cost you around $350, plus your time.