Yea, I agree those are the most important considerations, no doubt. As long as the engineering specs are up to date with the config, and it's a full spectrum light, I really think there are lots of good choices out there right now. The market is fairly saturated with good products. Some are going to be a little more efficient than others, or run a bit cooler, longer shelf life, ect...
The LED game is undoubtedly in full swing and overtaken the traditional market. It's a new way of doing things.
Most of the bells and whistles simply revolve around features, and higher efficiency. The basics can be obtained for much cheaper and will still yield outstanding results.