you might consider waiting a little while for your store of choice to get this in stock
http://www.swiftnets.com/products/MCRES-1000.asp or buy directly from swiftech it looks like a great product
see this thread
also, it may be cheaper to buy the system in parts instead of the kit (not sure)
one rad should cool it, definatly wait with the second rad and see how your temps are
if they're not great then add it
also, then you will have the case and will know exactly what your size constraints are