Red Label: the basic version, so to speak. The Scotch with the highest market share worldwide. Contains up to 40 whiskies. ~13 EUR per 0.7 litre bottle
Black Label: heavier and more masculine. Contains over 40 whiskies all of which are at least 12 years old. ~22 EUR
Pure Malt: soft and rich, fresh. Contains only single malt whiskies, at least 15 years old. Higher alcohol level of 43%. ~35 EUR
Blue Label: Intensive, yet subtle. Tastes a bit like sherry. Composed of 16 single malt whiskies, some of which are over 30 years old. ~140 EUR
Gold Label: Light and honey-like.
Premier: Sweet, a bit salty. Very distinct malt taste.
Swing: Hmm, difficult to describe. Tasted it only once so far - strong and tastes of spices. I didn´t like it that much because of a somehow rotten taste, which some people call "grassy".
Red, Black and Blue Label (and to a certain extent Pure Malt) are the standard types. I´m sorry I have no idea about the prices of the other three since they´re not officially available here in Germany.
Hope this helps,