These are them at about 10 weeks just before transplanting into 5,7,or 10 gal. containers. Have just used 5gal in the past but bigger is definitely better. I'm growing all organic with "Danny Danko's Magic Organic Mix for 5-Gallon Buckets" taken from the Feb. 08 issue of HT.
Recipe is as follows:
3 parts Canadian Sphagnum peat mix, coco coir or pro mix.
1 part large chunky perlite
1 part worm castings
1/2 cup green sand
1/2 cup dolomite lime
1/3 cup Peruvian Seabird guano
1/4 cup Epsom salts

I replaced the worm castings with a local composted cow manure (Moo Doo) because its cheaper and easier to get. For the larger pots I just added a little more with my own judgement. Last year used the peat mix but this year I just used either Moo Grow potting mix, Fafard 3B pro mix, or whatever was left in last year's pots. I'm trying to steer away from the peat now as I'm kind of an environmentalist and the peat bogs/forests are being depleted due to over harvesting, but that's another thread. So I just water once a week (weather depending) with my homemade compost tea until flowering, then I will use Jamaican or Indonesian bat guano tea to finish them off through flowering.

Pics: White pots are BCD (BlueCityDiesel) other ones are Purps.