Good morning!
To answer your first question, you'll have to build your own shroud: cardboard, sheet metal, whatever you can or are willing to do. All you have to keep in mind, is keeping the fan 1 inch from the core.
You might look into the BI2, but only if you're willing to fork out $100 (US) for it. It's basically a double BIX.
The fan will work fine, but again, the more air you can get through, the better it will cool. This is where you're really alone, because it's a personal balance between noise and cooling ability. Try to think outside the box: make a custom shroud to hold two fans side by side.
The benefit of the heatercore is this: because of the much larger surface area, you won't need as much air going through it, compared to the BIX, to achieve the same result. That being said, if you keep the same fan solution, your temps will drop. Know what I mean?
The BIX should be able to handle a 9700 GPU very nicely. If you want to cut costs though, you can sell your BIX in the FS/FT forum.
Your proposed airflow path isn't optimal, but should work fine. Ideally, air comes in the front/bottom, and exits the back/top. Many articles detail this. Experimenting is always good though.
Two heatercores may be overkill, but may allow you to drop your coolant temp a couple of degrees extra. This may or may not affect your CPU temp: as a gross estimate, a 3 degree coolant temp drop may result in a 1 degree CPU temp drop, in an efficient system.
Again, if you want to save yourself the shipping charges, you can pick up a heatercore from a local shop. I assume that you're mobile...
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