what shall i buy

shall i buy this wilma 4 pot system http://www.greenshorticulture.co.uk/Hydroponics-266/Wilma-Systems-272/Wilma-4-Pot-System-253.asp
or shall i buy 4 11ltr pots with tray http://www.greenshorticulture.co.uk/Pots-Trays-22/Tray-Pot-Combo-s-313/Square-Tray-Square-Pot-Combo-s-982.asp
and some batmix http://www.greenshorticulture.co.uk/Growing-Media-198/Premium-Soils-347/Plagron-BatMix-50L-647.asp.

i have been using soil but i want more yeild. i have a 250w hps and a 80 x 80 x 160high grow tent lined with milar

also why whould my 2 big bud plants leaves be really droopy and lower leaves turning yellow from bottom upwards.they are about 2 and half / 3 weeks into flowering

would like some opinions asap so i can order the right choice

I'd go with the first option, the Wilma four pot.

Leaves are droopy probably because you've neglected to water them. All soil growers should invest in a Moisture Meter, available at your local nursery for around $10.

Vi

i poked my finger in and its damp in the soil