Exhaust: Which Would You Do?

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Update 2:

The manifolds/cats from Davico (purchased from Rockauto) have a problem. According to the shop, they're not manufactured well and so won't seat flush with the heads. They're not an exhaust specialist shop, but very experienced with Porsches in particular, and exotics of all types. I take my Lotus to them. They have other Lotus they maintain, as well as a bunch of Ferraris, Lambos, Jags, Alfas, and a bunch of exotic classics too.

Anyway, my options are to return the Davico parts and spend a lot of money on OEM or highend aftermarket manifolds/cats, or take the car and the Davico ones to a specialist exhaust shop and see if they can work some magic to make the seal properly. I could also look for some used ones on eBay or at a recycler, but that's always iffy.

For the moment, I'm having the originals put back on so the car will be drivable. All of the other work is going to be completed as planned.

Anybody have any input? I'm not leaning toward spending the big bucks on a car that isn't worth a lot as a whole. I'll spend money (I am), but can't justify spending anything like 3 grand just on the exhaust.