i would get those big white trays they use for wash machines. depending on plant size, you can fit several in a single trey. i myself use bigger regular treys but i dont have a reflective floor either. you probably wont get a ton of light from the reflective floor anyway. i would set up CFLs or LEDs down there instead. if your using hps then you can add blue spectrum that way.
i switched to air pots and dont like them. the water always runs down the sides and on the floor if i dont use a bigger trey. i dont even notice a difference in growth with them. i just like how they dont have holes in the bottom so fungus gnats are easier to control if they occasionally show up probably from poorly stored soil. although they will eat the roots that come out the bottom against the trey. it's nice though how you can transplant without removing the plant from the pot. roots grow right through the fabric. might depend on the brand though.