welcome to the board matt! go swing by bmwusa.com to price it out. the perf package, also known as the zhp, (bmw internal code) is a $3900 option that simply remakes a great ride. you can read it, but the 10 hps, type 135m rims, m-tek front m3 lip spoiler etc, simply makes the car. the cube trim on the inside is sweet too! i personally still like the sedan better, but it's because i really dislike the 04 facelift they gave the ci, prolly in anticipation of offering the zhp package for the coupe. (since if they offered zhp in an 03 or earlier model, there wouldn't be that big a difference in looks btw 330ci zhp vs m3.)
even tho i love my car, i'm still torn btw her and an m3. and if i had another $10k+ lying around, i might've sprung for the m, but i think i made the right decision.. (or so i tell myself..