To the OP, the Tri-Noosa is a performance shoe, not a training shoe. This shoe is meant for competitions where you are keeping a mazza-fu-king Kenyan mofo pace.
When getting a training shoe, more weight in your shoe isn't a problem. I wear 'cushioned' running shoes because I'm a heel striker and have a high arch. It's like 13+ ounces. Performance running shoes are like sub 9 ounces. Minimal cushioning.
Check out this link.
Best shoe I've had was Adidas Response. It's got a lot of foam. Not with the funky holes in the midsole or see-through sections.