Go for the GTI (I'm biased if you haven't noticed...towards VW's ;) )
But seriously...If the SVT has a salvaged title like that then it might not be worth it if you want it for a daily driver. There might be way too many potential problems waiting for you as time goes on and it might cost you more in repairs then it would the difference between the SVT and the GTI.
As for the mpg...i can't agree with everyone on it being based on your foot...cause i have never seen above 22 mpg with my car and it's gone as low as 14 mpg (winter). Granted it's all city and there are probably other factors involved...but even when i drove lightly and granny shifted the mpg never went up all that much. There are also other people on here that don't get all that great of a gas mileage so i know i'm not the only one
Beginners can drive fast in a straight line...
Intermediate drivers can master corners...
But truly advanced drivers find their own course and that's how they get ahead.