First off, a heatercore will be better because it will give you more surface area for the coolant to, well, cool! Ask anyone here, a BIX is a poor choice for two pelts.
Now don't get me wrong: it'll still work, but you loose a lot of efficiency by not having a better core.
IF you don't think it's worth it, then by all means, go with the BIX.
Seeing that you appear to be limited to a relatively small opening, I listed the thickest commonly available heatercores available.
2 fans appear to help, in some cases. It depends a lot on what you're trying to get air through: a 2 1/2 inch thick core is probably fairly restrictive, so 2 fans would be most helpful. An oil cooler type rad, with widely spaced fins, probably not.
How helpful? Check out the radiator roundup article to see (link provided on first page of this thread).
Either way, you won't loose by trying the cheapest suggestion first.
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