hey dean, that's wonderful!!!
so, how are you enjoying the new master testkit you bought so that you could tell when the cycle is complete before adding fish to your new tanks?
also, if you have the tubs, but no filter, what exactly are you cycling? i'm pretty sure stagnant water doesn't cycle, it just gets kinda cloudy and starts to smell a little.
for the filter, whisper i20s would be the most affordable, and easiest to hang inside a rubbermaid tub. somewhere there's a post floating around where some very knowledgeable people gave some great advice on cycling the filters of a tank; such as "feeding" them, etc.
ur probably gonna have to get a little creative with the light. i don't think rubbermaid makes hoods or lamps yet. a custom-cut piece of glass would work, but that's probably a little out of your price range. maybe if you plan on fish that aren't too keen on jumping, and you don't fill the rubbermaid completely, you could forgo the lid and just use sunlight or a bedroom lamp for daytime light.
if you're gonna keep it on the floor, make sure you don't have any other pets that might find a bowl of water intriguing, like dogs.
if you're doing tropical, which i pray you are, you'll need a heater. be careful where and how you put that heater in the water, as heat melts plastic. which is why you don't often hear of people doing tropical tanks in rubbermaid tubs. you see it more as winter homes for koi (and by that i mean 30 gallon homes for koi that will soon be going back into their 1000 gallon ponds, which i don't think applies here).
yellow or light pastel colored stones (blue, orange, pink) would open up the space and make it appear brighter. going barebottom or riverstone would remind you to do gravel vacs. using the tubs to move your stuff out of your bedroom instead of house fish in could potentially save some fishie-lives.
hope that answers your questions.