I had a Rossignol Imperial back in 1998, and I had one in 2006. It was then (1998), and I beleive was still in 2006 a directional lower end board with an extruded base. The board rode very well, very smooth flex, and was very durable but a little heavy. Either way for the price range, and for what it was it was a good riding board. I think its better for cruising, an deeper snow more so than park though as its directional and I think it has a little taper in the shape.
From what I know of the Contrast, is that it is a very similar board to the Imperial in that it is a directional shape, and has an extruded base. They are price point boards basically.
For bindings I would go with the Drakes if I had to choose from those options, as I found Rossignol bindings to feel restrictive in the flex in my past experience. The reason the package with the Imperial board would be worth more is most likely because you are getting a better quality binding.
Here is a listing for a good pro level board for $120 usd (+ shipping & whatever taxes your province charges on goods sold). It has a sintered base, twin shape, and better overall materials than the two Rossignol boards you suggested in those packages.
Snowboard M4 Discord 154.5 New 2007 - eBay (item 140359007914 end time Dec-10-09 16:04:58 PST)
I would suggest shopping around a little as you could easily find real good discounts on NEW boards, boots, and bindings that are of much higher quality than the ones you listed. I'm not sure which size you are looking for though?