Damn son, calm down, I'm trying to help. Chill.
If you go out and look for a gigabit dedicated line, you're going to pay a fuckton of money, and it won't get you what you want.
A "dedicated" 20mb line (which, btw, is not as small as they go, you can get a "dedicated" 10mb line) would get you 6TB in each direction per month. That's not that much bandwidth! On the other hand, a dedicated gigabit line would get you 320TB in each direction, which is likely more than you need (based on the typical usage of a gaming server, which doesn't require a supremely large amount of bandwidth). I'm just worried you're misunderstanding what exactly a dedicated line means.
What I think you really need, as others have said, is a host with a large enough upstream and filtering capacity that they can take a 150mbit "ddos" (which really isn't that much! You can clear that on a gigabit line no problem!) long enough for you to null, and possibly larger ones with the same ability. Getting a "dedicated" line brought in isn't that. Unless you're announcing your own addresses and have a lot of bandwidth brought to your own rack, you're still going to get shit from the DC when you take a large DDoS, and you're going to need to rely on their ability to null, whether that be automatically or at your request.
But hey, don't listen to me, go spend $1500+ on a dedicated gigabit and still get in trouble when you get a DDoS, be my guest!