piezo pickup suggestions?

I'm going to replace my bridge with 6 single string bridges to help isolate the sound from them. Now after that, I need 6 little piezo's to attach to each one. I know piezo's are really simple and come in all shapes and sizes, but I know almost nothing else about them. I need some really small high quality piezo's and I was just wondering if anybody had any suggestions for this? I have a budget of about 25$ per piezo. Maybe more if the quality is high.

I believe I'll also need a preamp for this.

For example: I was looking at these:
http://cgi.ebay.com/DIY-PIEZO-PICKU...5|66:2|65:12|39:1|240:1318|301:0|293:1|294:50

but should I be catious about the quality of something that costs 2$?