Cold Steel Espada, Large (5.5" blade) or X-Large (7.5" blade)
http://www.coldsteel.com/espadaseries.html

Spyderco Police, 4.375" Blade
http://www.spyderco.com/catalog/details.php?product=358

These knives are awesome, but maybe out of your price range. The XL Espada is the knife to get if you have a taste for the ostentatious. It's a monster. View those Cold Steel videos to get a sense of how big a 7.5" blade folder really is. A blade of 4.5" on a folder is already pretty huge. I've handled these knives, but I don't own them because I have a policy of not paying more than $75 for a folder. wink
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If you're reading this, it's too late.