I agree, rage gold is an excellent filler made by "Evercoat". It is a little pricey, but like many things in life you get what you pay for. Beware of bargan, department store brands that save you a few dollars, you have a good chance of cursing the product when you start blocking a panel and it takes forever to sand. Also, I have never had a bleed back (bleed back is when the colour in the hardner comes through after you paint... rare but I've seen it happen on the lower end filler) problem using this product.
In short, I would highly recommend this product.