lol, "SpooledupRacing" is getting attacked in this thread! Jeeze!.....
A stock GSR front strut bar would do you just fine if you're looking on a budget... I honestly didn't notice much of a difference between the 2 on my civic when i switched them out....
Second, I highly recommend a bigger rear swaybar before you'd need any sort of c-pillar bar or rear strut tower bar. It simply doesn't move enough in the rear to need something like that back there to have to use up the extra point in autocross.
Third, Don't buy the ASR subframe bar if you're not going to upgrade your rear swaybar. another waste of money
fourth, As already stated Poly bushings will be the most amazing upgrade you'll ever do to your car.
And Lastly, all of you are wrong about the rear lower tiebar... There's nothing there to flex. The point of having it is to do exactly what any subframe brace does (i.e. Beaks bar/ASR bar).... minimize the possibilities of subframe tear out from using a bigger rear sway bar.
Between those 2 points on the rear end is just metal... There's no actual stress being put there to flex anything, because the flexing is happening in the body top to bottom, not halfway thru....
I haven't experienced it, but I've heard the front H-Brace makes a big difference... just 2 cents.