Was looking at Metal 2 Metal but that shit is expensive.  I don't really have much experience in body work but I'll manage just fine.     
What do you guys use, and/or suggest for a beginner?     
Also, why you're here, will this make a good hammer & dolly set? 
http://www.amazon.com/Heavy-Professional-7-Piece-Hammer-Dolly/dp/B000IAWLBS/ref=pd_bbs_sr_1?ie=UTF8&s=automotive&qid=1236817457&sr=8-1   
edit-What's the difference between regular fillers and those labeled as lightweight?  Which should be used?