-JPM Coachworks leather and alcantara interior trim pieces: $???
-ALSA Ghost Chrome metallic paint, professionally paint silver interior plastics to resemble real metal: $???
-Perrin header-back exhaust with cat and resonator: ~$1700 +S&H
-KW V3 coilovers: ~$2000 +S&H
-Prodrive GC012L wheels, 18x8.5F/18x9.5R: ~$4500 +S&H... FUUUUU

But I want them sooooo baaaaad!
-Hankook R-S3 tires 225/45R18 F/255.35R18 R: ~$900 + S&H
Those would be my first mods, and would probably eclipse $10k but you get the idea. The wheels are the real killer... Plus the first thing I would do is a full exterior detail with Opti Coat 2.0 and 3M clear bra for the entire hood, fenders, front bumper and mirrors, which would run around $1,500 if I had to guess.
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Current: 2005 Porsche 911 Carrera S 6MT
Previous: 2 BRZ's, 997 C2S, C5 RS6, C4 S6, B8 S4, GDB STi, S30 240Z, FC3S RX-7 TII, AW11/SW20 MR2, E30 318is/325i, etc.