I am currently growing salvia hydroponically. my setup is as follows:

3:1 perlite:vermiculite
Miracle Grow Patio (20-20-20) fertilizer, 1/2tsp per Gallon
24/0 light:dark, with 2x 48" flourescent soft white bulbs.
the smallest air pump whisper makes, with two "air stones," about 6" long each, airating the water.

the cutting is residing in a gallon water bottle with holes through the bottom for draining/irrigation. the bottle is in a large (2'x3'x8") tub, with about 1.5" of water/fertilizer in the bottom.

total cost of setup:

tub - $5 at Wal-Mart
Fertilizer - $3 at Home Depot
Shop Light (with bulbs) - $10 at Home Depot
Vermiculite 8qt - $3 at Home Depot
Perlite 8qt - $3 at Home Depot
Water Jug (as if you didnt have one) - $.87 at Vons
Salvia cutting - I cut it from other plants which were givent to me by a friend
total cost: $26.

power consumption is probably less than 40W.

I will keep results posted to the list. The plant looks super happy, and its only been in the perlite for 1 day! :) :)

Danke,
alex