Depends on the dash. I belive the one you note has the new style dash, but I find the older dash to be quite nasty. (Has round gauges, where the new one was a large panel with great clear numbers.)
Engines are very stout, but don't really make tons of power by today's standards.
The turbo model is not just the motor. In true Porsche standard, they also have better brakes, and suspension tuning is better on the Turbo than the NA prior to the final years of this vehicle.
I would not buy a 924, or 914, but I would have no issues with a 944 with nice phonedials (*Rims that look like old school phone dials.) Definately if you can get a nice 944 Turbo, go for it. Brembo brakes, better suspension, I like the front air dam, and with some pretty simple tweeks, you can have a nice 300rwhp car with great handling.
If you really want cheaper power, don't do the turbo engine swap. Just pickup a V8 conversion for the 924/944 chassis. They are not expensive, work very well, and will net you a nice small car that handles excellent, and if you put a aluminum SBC V8 under the hood with modern EFI, excellent fuel economy and power is possible.
That being said, my Dad's 1989 944 was a total money pit! The clutch was not bad, but he replaced it to the tune of about 3k. Then he found a seat with no rips, another 250.00. He also replaced a few interior bits that were worn out, and all of that stuff was not cheap. The car was very fun to drive however, and handled great.