if you are planning on spending 20k why not consider the dodge srt-4 or the vw gti 1.8l turbo? Turbo cars have much much more potential for less money spent than an si. The srt-4 starts at 20k msrp and the gti is 19k or 22k if youd rather have the vr6.

Also, the gti is very high quality and has a nice interior. Not bad handling either.