luigi90210

1. afaik, steering lock was fixed in 2010
2. only really applies if you track your car and/or drive like an *** on public roads, i cant think of one senario where a regular driver will run into this issue unless he is driving an ***
3. this is the only real failure here and can be fixed with an aftermarket CSC and it only affects the 6MT 370z, this problem doesnt even exist on the 7AT 370z

now here are some problems that exist on all ISF models(well models with DI)
carbon build up(though not as bad as the IS250, its still pretty bad), you have fake exhaust tips, and no manual option(which isnt a problem but if you are gonna buy AT than you should compare problems to the AT 370z not the MT 370z)

@OP
if you want a sedan that will go fast and make good power, i would suggest a used M3, used AMG Mercedes, a used CTS-V, or a brand new Charger SRT8
here is a video comparing the C63 AMG and M3 to the lexus
https://www.youtube.com/watch?v=pXIIieUFH0M

oh and if you want to stay with japanese imports, you can always find a used EVO 8/9 making loads of power and even if it isnt, you can always retune the car, install a FMIC and CBE and make good power off the stock system(iirc the 4g63t stock internals are good for 600whp, and stock fuel pump should be good for 25psi and the re-circulation valve on the evo9 can easily hold 27psi)

imo though, keep the Z but if you really want a sports sedan get something else other than the ISF