I have a nearly identical system on my roof, but it uses 6 panels that are 2' wide by 20' long for a total of 12' x 20' for my in-ground pool. Mine is made by sungrabber.
They are made of thin plastic molded tubes and can be punctured if handled roughly but it is easy to plug the individual tubes.
I suggest you check e-bay before you buy.
I paid about $900 for my entire system IIRC, you should be able to do your system with $150 or so.
here's one example:
http://cgi.ebay.com/2x20-Above-Ground-Solar-Swimming-Pool-Heater-Panel_W0QQitemZ180369791485QQcmdZViewItemQQptZLH_D efaultDomain_0?hash=item29fee099fd&_trksid=p3286.c0.m14&_trkparms=65%3A12|66%3A2|39%3A1|72%3A1205|293%3A1| 294%3A50