I'm another KitchenAid fan, and since in your original post you said money wasn't necessarily an issue go for the 600 series, it's got a powerful motor that will beat its way through anything. Mine's named Martha, she lives on my counter, she's gunmetal grey and a dream to use.
While you're at it, get this beater blade to use with it - it's the one that KitchenAid should be selling with their mixer! Amazon.com has the best price I've found, free shipping as it's over $25.00.
While you're at it, get this beater blade to use with it - it's the one that KitchenAid should be selling with their mixer! Amazon.com has the best price I've found, free shipping as it's over $25.00.