Is the Audi in perfect condition? If it's selling for 700 bucks it probably needs work too... I don't know how the turbo 5 would compare to the naturally-aspirated six in terms of power and driveability, but, certainly both would have less power than the six with the turbo, and the D24T turbo six should be easier to put into a 240 than the turbo five anyway.
Not trying to discourage the idea of the project, but the Audi engine is architecturally identical to the Volvo motor except for the difference in the number of cylinders so just keep in mind that if all the Volvos you are finding need help, the Audi will probably not be any better! And if you decide you're going to invest some work and money into something, my guess is that you'd get better results for your dollar by starting with the larger-displacement six...
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86 745 D24T/ZF 345k lifted 2.5"
83 764 D24T/M46 155k
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