I'm in need of some direction in regards to....

what is the best body filler out there that you guys have used and had great results from???

I was told that Evercoat's "Rage Extreme" is supposed to be great stuff as well as Tiger Hair....was told to use tiger hair and then a filler over that for areas that are rough, like around welds that have been grinded down but need filler, etc.?? Any advice is greatly appreciated!!?? Well I need some good advice as quick as possible because I'm looking to get my '50 GMC in filler and ready for primer by Tuesday if not sooner!
Thanks in advance guys!!
Jason