first off, don't race. you'll save gas, your life, and your car. plus, you won't have to face the depression of being beaten.

but if you must stay away from (common cars):
corvette (c5 and newer)
Z28
boxster
GTO
350Z (just being honest)
cayman
new altima (3.5)
g35s/g37
mercedes slk 350
wrx sti
lancer evo
any M series bmw
svt lightning f-150
mustang cobra
passat w8
r32 golf
srt-8 charger/300


cars you can hang with/beat (common cars):
mustang gt (interstate)
solstice (slowstice)/sky
v6 mustang and camaro
civic si
rx8
base z4
lotus elise
s2000
miata
tiburon
c4 and older corvette
srt-4 (stock)
charger r/t

probably the most expensive car a regular crossfire can keep up with (in a straight line) is a regular naturally aspirated lotus elise (not exige).

as far as "smoking" vehicles, try racing a stock '98 civic. that's about the only thing you'll leave behind in a matter of seconds (unless you race a 4-cylinder truck or something.