[Buzz]

Hi Chuckster. Comparing brands is always a touchy subject because of the broad spectrum of personal tastes and brand loyalties and it almost always turns nasty, so most people just refrain from commenting publicly. As for resale, you are wise not to look at a Cobra replica (or any new vehicle) purchase as an investment as over the short term almost no vehicle can be expected to hold its original value.
For the presentation to wifey, use the same argument you would use to sell her on the purchase of any expensive commodity - Its better to spend a little extra up front if you can to buy a quality product as it will look better, last longer and lose less of its value and market appeal over time compared to a cheaper or inferior brand. It also helps to tell her that buying a Cobra will put you right in the mood to do that kitchen remodel she's been hinting about for the last few months.
Engine selection is another BIG can o' worms for the same reasons mentioned above. Here's the purist point of view that is subscribed to by many owners of the premium brand cars: Big block FE series engine in a 427 replica and a small block in any 289 series replica ( FIA, USRRC, slabside, etc).
Most others are content to have an accurate looking replica powered by the engine of their choice and hotly debate the big block vs small block issue based on the pros and cons of weight, handling, torque, power, "look" and sound. At the end of the day it boils down again to what YOU want and that's really all that matters. Windsors are very popular, flexible platforms for building a nice, powerful motor - commonly stroked to 396, 408 and 427 cubes. Which Roush motor are you considering?