£45 is a good price for a prodrive backbox, yes.
Are you sure your uppipe has a cat in it? I'm sure some of the blobeye wrx's ended up getting straight through pipes like the STIs but i think it was only the later cars. All of the bug wrx's certainly had cats in their uppipes, but worth checking. As Nick says, don't get an aftermarket one with a bigger bore - worth looking for a genuine STI one as bigger isn't better for an uppipe....
And in terms of sports cat - if its off a STI PPP, then its a good upgrade but will require a remap. If its a standard STI cat, then there's no difference over the WRX one you'll have already (assuming your car is standard).
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