For ammo you need to do your research. Start here: http://rkba.rmkhome.com/ammo.html
As for a spotting scope... My budget will not let me get a nice one at $800-$1000+ so I shopped. I bought some low priced ones but at 200 yds the had color separation and shadows when looking at targets. I ended up buying a Nikon (model unknown, about $150) when it was on sale. It's good out to 300yds but that's about it's limit.
What ever you end up with make sure you set it up (before you buy) and scope black and white lettering at the farthest distance you are able to. If the edges are not sharp then walk and shop some more.