For panoramic shots (and I presume you're doing landscapes), I'd probably go with the Nikon D3xxx body (e.g. D3300, D3200, or D3100).
These are Nikon's least expensive entry-level DSLR bodies (with the D3300 being the most recent and most expensive of the bunch). Check to see if you can pick up a "refurbished" body from the Nikon store here:
Refurbished Cameras from Nikon | Used DSLR Cameras
I noticed the D3100 is only sold with two lenses included (driving up the price to the $700 range) and even though the D3200 is a newer camera, they'll sell that with just one lens at $399 (a $50 stretch beyond your current budget.)
The reason I'd probably avoid the Canon is because their entry-level bodies in this price range (and they do have them) do NOT include a "spot" metering mode.
Spot metering is important for landscapes because ideally you look (with your eyes) and finding the brightest white highlight in the scene that you can find (perhaps a white puffy cloud or a white snow-capped mountain top -- btw, never meter the sun if that's in the scene even though it's the brightest thing... there's no such thing as an exposure that will tame the direct sun. It will always be blown out. Just ignore it.) Meter that "brightest highlight" object. Next find the darkest blackest shadow region you can find (probably something dark and located in the shade). Spot meter that object as well. Those two metering samples (this is all before you shoot) give you your exposure range. That's what you need to capture to get a good shot. You need to capture the middle exposure (halfway between the two) plus an exposure that grabs the highlights and shadows without blowing out or clipping them off.
On the D3200, the "spot" metering mode is an area in the center of frame occupying (according to Nikon) about 2.5% of the frame (3.5mm circle). The actual size of that metered spot in real life depends on the focal length of the lens attached. I own a hand-held light meter which, in addition to "incident" metering, can also provide a 1º spot metering mode -- that's what I use to meter a landscape (in which case the camera metering capabilities just don't matter... but the light meter costs more than these cameras so that's probably not an option for you.)
Could you use the Canon anyway? Sure you could... but you'd have to meter, then check the histograms after shooting to make sure you're not blowing out or clipping highlights and shadows. Basically you'll take a number of shots and check the histograms for the sole purpose of finding the right exposures... THEN you'll set up the camera to take the bracketed exposures (and you can trash all those test shots.)
Image quality, lens selection, and all the other tech details won't be much different between the two cameras (they are different... but not so different as to create noticeable and meaningful differences in your results). BUT... the ability to do spot metering for landscape photography is important and I think you'll be better equipped with the Nikon body (and I'm a Canon shooter -- for what that's worth.)