For personal defense, the 640 with no hesitation
For collecting, the 2" 64
However, at $400 each, I would simply buy both
If you can not afford both in a single purchase, put a deposit on the pair with an agreement as to when final payment is due. In the olden days we called it Lay-A-Way
You do not have the instant gratification, but you would have two fine additions to your life long collection
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