A couple things to think about here that hasn't been specifically mentioned. The Baer PBR floating type calipers are probably going to work a little better, IN GENERAL, on a stock type spindle, when you have a lot of grip in turns, than a fixed type caliper (such as Wilwood). The problem is the spindle-hub, not the brakes, and basically what happens is that the stock parts flex, and force the pistons on the fixed calipers back into the body a small amount. The result is a soft-long pedal that is cured by pumping once or twice (or three times). This deal is a LOT more prevalant on fixed caliper than it is on the floating type calipers, I can specifically tell you this from direct, current experience. I switched from the early type PBR calipers to a very nice set of Alcon mono-block six pots on my 69 test mule earlier this year, and the knockback is now pretty bad on the track, to the point where I pump the brake pedal very lightly with my left foot after every hard turn, prior to getting on the brakes in hard braking zones. It is really pronounced with manual brake, which I have, but would still be an issue with a boosted setup.
People rag on Wilwood, but it is a bit unfair. The reason, most likely, is that the kits that most of them have experience with, such as any that are listed in Summit Racing or Jeg's catalogs, are garbage. I bought a set years ago for a Chevelle, and they were less than awe-inspiring. The calipers have significant flex in hard braking, and in general the rotors are WAY too thin for anything but drag race use, which is exactly what those kits were modelled after. Those are not the only brakes they offer though, they make some pretty serious race stuff that I am certain is as good as some of the competition's upper end stuff.
On a budget, it is nearly impossible to beat the C5 type stuff, the front calipers are greatly improved from the first generation (i.e. C4) PBR twin pot floaters (which by the way, have a nasty reputation for failing dramatically on track cars), front rotors are thick at 1.25", overall a really good setup. Pad selection is really good, basically all of the good pad suppliers offer several different compounds, right off the shelf. Besides that, if you decide down the road that you need more capability, you can buy a kit from many of the upper end suppliers that will bolt right on (Stoptech, AP Racing, and many others), but bring your checkbook. The good stuff is expensive, for good reason. Expect to pay $5k for a four corner set of brakes, or more. Overkill for the street, but right at home, and necessary, for consistent track usage. If that's not compelling enough, the new C6-Z06 stuff will also bolt right on to the C5 brackets, and should be a really affordable upgrade when readily available (PBR is making this stuff, interestingly, but currently have no plans to release to the aftermarket due to capacity reasons, I asked: boo hoo).
Mark
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