The 07 will have a twin plug head, no more horsepower but was done to clean up emissions. Maybe will have some advantage if tuning for more power, but the sure bet is that it will double your expense when replacing plugs for little or no gain. ABS will be offered for a large price premium, likely will use the same pads so IMO is not worth it. You could likely pick up some better four pot brake calipers for less money.
Twer it me, I would haggle for price on an 06, and run with it until Suzuki comes up with the real upgrade- I think (hope) we will see the big improvements in a year or so, as the bits off the 00-06 GSXRs become surplus and cost effective to put on the "budget bike" that fits my needs o-so-well. :D
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