Homebrew PCBs

Is there some simple but professional plans to build an etchant tank? I 
mean with heater and agitation, not just a jar and manual labor:) Or is 
one available that is professional but not too pricey? I seen one for 
$50 and I bookmarked it. http://www.web-tronics.com/lowcosetsysw.html  
Is that worth the $$ or could I make something with aquarium parts 
(heater, pump, etc). I was also planning on using ferric chloride as I 
have a bottle from RatShack from when I started getting interested in 
this some years ago. I know there are other etchants and comments are 
welcome on whats best but I think other than the staining and inability 
to see your boards progress, ferric chloride is probably as good as the 
others??

Thanks,
Dave