Blacktie, I'm not exactly sure what you really want.
1st. you say you're not big into spoilers, then you say you're looking for about the most radical spoiler you can get.
If you have a Limited or Base car, you can disable your spoiler simply by pulling the fuse, that way it's out of sight, and out of mind. "Disclaimer" Under no circumstances am I telling you to do this, The spoiler is there for a reason, and if it is inoperative a warning BEEP will sound above 90 mph to let you know that your car is now entering "The Highway to the Danger Zone." So if you still choose to disable your spoiler, you do it at your own risk.
If you drive normal and simply stay with traffic most all the time, you should have no
problems at speeds of 70 or 80 mph on dry pavement.
Personally I've installed a kill switch on mine, and I only put the spoiler up at highway speeds if I get caught in the rain.
As for the radical spoiler in the photo, it looks just like one that an old friend of the forum "HDDP" installed on his black 04 Race car. Why? Because he seriously raced his car, and it took a spoiler like that to make his car competitive.
CrossfireForum.org - HDDP's Album: Member Galleries - Picture
Unfortunately, HDDP chose to move up the Food Chain and started racing his Corvette, and hasn't been around these parts for some time now. So I really can't give you any information as where he got his spoiler. But Good Luck with what ever you deside to go with.