Tools you wish you had

[c10hunting]

I am looking to pick up a c10 SWB project here shortly. I like to lurk in the project section and have learned alot from watching you guys. I'm not sure how far I will take my project, but at a minimum I want to box the frame and do a dropmember, air ride, c notch. I am going to pick up a tig welder soon and practice on whatever scrap metal I can get a hold of. I just sold my mig from harbor freight because I want to get one with gas. Anyways all my rambling. I am curious what tools have you guys found to be invaluable when restoring your trucks? What does everyone use to make such clean cuts when cutting out sheet metal? What is used to cut out patches for the firewall? I am mainly concerned with metal working. Thanks for any input.