I was faced with the same descision and decided to go with a 2005 pre msrp increase GT. I figured that in a month or two you could find a 2005 ( and maybe 2006) for 5 to 10 grand off but more than likely it would be a color I did not want or a post price increase car. So for me, the right color car, above #500 or so to avoid the "speedi sleeve" issue, at the old msrp, right now, was the way to go.
2005 Ford GT Silver/Black Stripes
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Our other cars: 2006 Z06 DSOM / 2006 CLS55 Silver / 2005 SL65 Pewter / 2005 G55 Graphite / 2005 SSR Silver / 2005 MazdaSpeed Miata Red / 2004 Gallardo Yellow / 2004 NSX Black / 2002 Candy Red Prowler + 2001 Orange Prowler + 2001 Silver Prowler + 1999 Yellow Prowler / 2002 35th Anniversary Camaro SS Convertible / 1970 Black Chevy SWB Pick up / 1969 Garnet Red Camaro SS 350 / 1969 Chevelle SS 396 / 1969 Impala SS 427 / 1968 Chevy Step Side Truck L98/700r4 / 1967 Hugger Orange Camaro 400 / 1966 GTO / 1955 Yellow Chevrolet Truck / 1934 Ford Sedan / 1930 Ford Hiboy Coupe 302 5spd