If you didn't have any, I would get the a30s. I would pick Astros over Tritton anyday. However, since you already own Tritton 720s...I would just keep those until they break unless you can sell them for a really good price.
I think some guy was going to give me 90 to 100 cash for them. If he does that would be great, but if he try's to low ball then i might not. Its rough, but all the features the a30's have make me want to get them so i can connect them to my iphone and my mac when im video chatting. the a30's also look very sleek like beats audio headphones. but arggggg!!!