I only use Hoffmans seed starting mix...
http://www.marketworks.com/StoreFrontProfiles/DeluxeSFItemDetail.aspx?sfid=124287&c=729283&i=238378589
it is the cleanest of the seed starting mixes and also IMO the lightest...true it takes a while for it to soak up the water but the way I do it is simply put the seed starting mix in the starter trays, plant the seeds, then sit the seed starting tray in water and leave it until the soil soaks up the water until saturated...this is just the way I do it...right, wrong, or indifferent...
I have used jiffy seed starting mix and the light warrior...again, this is my opinion, but, the jiffy seed starting mix is not as clean as the hoffmans (twigs and larger bits of "stuff"), and the perlite in the light warrior is too large IMO....