if your planning on running a single grow with all the same strains... the tote could work but then again root tangling is a huge problem as it can and will harm the plants, no doubt about it, honestly if your growing a few different strains or as THG does a perpetual grow the 5gal buckets are your best bet. iv run a few 5gal DWCs from start to finish and they are great. i started with a 6inch net pot so no need to transplant or anything just simply move the bucket into the flower are and change the nutes from veg to flower as you normaly would. pretty easy. the tote is a decent idea if one you have the right sized space for it, basically right around the size of the tote and not much bigger then maybe an inch or 2 space around the tote, gotta keep it tight, and the tote idea will only be beneficial for vegging, well at least untill the roots start to explode out of the net pot and are a few inches long, then you would need to take them out and pop them into a 5gal bucket and continue your veg till they are the size you want, then flower, if you dont remove them from the tote at the right time the roots will tangle and cause problems. iv seen a few people use a tote for starting their DWC plants but after about the 3rd week they MUST relocate each plant into its own 5gal bucket.
having each plant in a seperate 5gal bucket helps a ton as it allows you to grow not only different strains but have plants at different stages of flowering in the same area, it also helps keep the amount of nutes you use with-in reason. and as you said you would like to do a Scrog... this also allows you to make individual scrog screens for each bucket, THG has a DIY scrog thread on the forums and its perfect for individual 5gal buckets rather then a large screen for many buckets, makes it far far easier to change out the nute solution if you dont have multiple buckets under a single large screen, individual screens allows you to take them out of the flower space easier and change nute solution easier, as well as allowing you the ability to rotate the plants if necessary.
all in all i would go with the 5gal buckets, maybe get some 2 or 3 gal buckets for vegging the plants(the 2 or 3 gal buckets will be the same size as the 5gal buckets only half the height, which is what i did after the first DWC grow. using the smaller buckets for veg is nice cuz you dont need as much water/nutes to fill the 2 or 3 gal buckets to the correct level, just a thought.
defently do some more research and if possible i really recommend steering away from the tote idea unless you ONLY use it for the first few weeks of veg then transplant so to speak into 5gal buckets (lift net pot out of tote and over into 5gal)
hope this all helps. DWC is a great way to go but when it comes down to it, KEEP IT SIMPLE!!! the more complex you make it the more problems youll run into. no need for a water pump in the buckets, only air stones, enough airflow to make the top of the water look like a pot of boiling water, lots of bubbles breaking on the surface.