The rifle will shoot well. I have very little doubt about that.
With regards to the scope and the case, you said it yourself...they are cheapies. Remember, with optics, there is a general rule that you get what you pay for. Personally, I would just get the Vanguard, and spend a little extra money and get a better scope. I'm not saying to get a $500 scope, or even a $400 scope (although it would be great for you if you did) but you can get a great scope for under $300. A few scopes that come to mind are the leupold VX-II, the Bushnell Elite 3200, and the Nikon Buckmaster, all in about 3x-9x-40mm.
Zachary