If you like the car and willing to pay $25,000, counter offer with $25,250 and tell him that its a deal. This is based on your research that 25,000 is is the range of prices of a car with these options. Good luck.
Comparing this price to others on Cargaru.com for your area, this price seems to be competitive. Cars with around 30,000 miles are advertised for $24,000 to $28,000.
Let us know what you decide.
2006 GT, Strut Tower Brace, Gas Hood Struts, FR Intake Plenum cover, Metal Fuse Box cover, Moroso brake reservoir cover, Rear shock tower brace, Front Bumper Lip Spoiler, JVC DVD Head unit w/ back-up camera, satellite Radio and USB input, 2 - 12" sub-woofers, 4 - 6"x8" speakers, 2 - 6.5" speakers to replace the door subs, 3 amplifiers, LED lights under the hood and in the trunk, chrome e-handle on parking brake handle, chrome cup holder trim, and trunk lid cover with running pony emblem.