Homebrew PCBs

Could those of you who are using Dry Film Photoresist 
please give any recommendations as to what you are 
using, results, and sources for small quanity supplies in 
the states? 

I have a Xerox 9" Laminator that I have successfully
Passed 0.060 board thru, so that's not a problem.
Markings on the temperature controller go up to 
125C / 257F. 

I am aware of "Think N Tinker" and "Micro-Mark"
in addition I have found quite a few suppliers of 
Dry Film Photoresist for "Intaglio" (SP?) print plate
making.

It looks as if what I've found so far is "Negative Acting"
and if I'm thinking correctly then a transparency for that
would require a LOT of ink / toner?  
Any "Positive Acting" resist films available?

Looking to laminate my own FR4 board and probably do some 
etching of Brass  / Copper sheet.

Thanks