This topic has been discussed before. See here:
strut bar question
Basically, you're better off buying a brand name if your comparison is an ebay bar.
At the same rate, you'll get more bang for your buck if you buy a rear SWAY bar
Strut = top
Sway = bottom
Those who have Auto-x'ed their preludes have always went the route of rear sways and nothing up front. There was a very through discussion regarding this a while back, but i'm too lazy to find it.