These seed-oils are bad food.
Best price for healthy calories in my area would be:
butter, eggs, cream, high-fat jogurt, high-fat quark, milk. (milk is debatable, but I can digest it well)
oh yeah and: fat is not unhealthy, neither does it make you gain weight (unless you add it to a high-carb diet of course)
RE: Taking a look at different fats for the diet.