Brace height pertains to two things.

Time that the arrow is on the string or
power stroke. This is the difference
between your draw length and your brace
heigth. A 30 inch draw length bow with
an 8 inch brace heigth would have the
same power stroke as a 28 inch draw length
bow with a 6 inch brace heigth. Both 22 inches.
The longer the arrow is on the string the more
time for things to "go wrong". Hence shorter
power stroke, more forgiveness. But less speed.

The other factor relating to forgiveness with
low brace heigth bows is their greater tendency to slap
the arm on firing and causing an errant shot.

I don't know how you feel about used bows, but
there are a ton of UltraTecs and ProTecs on the used market
right now with all the bowheads getting ready
to "just have to have" the latest and greatest
from Hoyt. i.e. the new cam and 1/2 bow. Ebay
and www.archerytalk.com classifieds are a good
source of used bows. They Hoyt UltraTec is a
very forgiving bow and plenty fast. ProTec even
more forgiving but most are seen in target colors since
a lot of guys use them for match bows. Appx. $400 should
get you either one in excellent shape.

dxr