ahh it's good to see LW and Z posting ;-)

I have to agree with JW and CYC on the res temp solution the simpler the better

Yer in a canadian basement so even during the summer the slab shouldn't be gettin above 60 (maybe in a heat wave) so you'll be fine...my 250gph pump runs 24/7 and it barely raises the 10 gallon res 5 degrees

As for the stealth I'd just cut the bottom of the cab out and sit the res right on the floor, especially if yer insulating the res it shouldn't be leaking too much smell at all

Pumps are only seriously affected by 2 things (within reason...really complicated setups will have a ton of things to consider) but that being said ya should only have to worry about how many feet high the water will be pushed and how many turns it will make on the way there (with a bit of planning I'm sure you can avoid looking like the windows screen saver) so just make sure the pump has enough power to deal with the height

best of luck doyu let us know how it goes