Just get the best one you can afford. I was shocked to find that the premium reflectors with tempered glass, flanges and high efficiency reflector were about the same price as the cheap ones if you add the tempered glass, and flanges. One thing that was a bit disappointing was there was very little holding the glass in because the angle brackets were so flimsy and bowed out in the middle. When I broke down my grow op I siliconed the glass in place so it could not fall out. I bought a box of 6" duct and ducktaped a small fan (minus the base) to the intake; it worked very nicely and was very quite. On my exhaust end I figured since there was nice, warm air coming out, I would use it. So I took a tall, narrow cardboard box. put a few brackets inside it and a couple of cor-x (cheap plastic sign material) shelves about 3" shorter than the length of the box. I staggered the shelves and cut openings at top right and left bottom. I plugged the duct into the bottom hole. The air flowed under the bottom shelf, up and over the bottom shelf full of buds, up into the next chamber and across the top layer of buds. It made one heck of a nice, quick, cheap dryer; my buds were very nicely dried - not too fast - in two days and it was basically free.