Quinton "Rampage" Jackson
The 2008 version of Jackson would be much, much higher. But Jackson has turned his back on much of what made him successful as a fighter. Jackson no longer throws his effective jab and now just looks for in close upper cuts and hooks. He has great power in his hooks and is dangerous on his feet for sure, but anyone who can keep him at range will contain his power.
Couture was Army Boxing Champion and has quite a bit of boxing savvy. Most of it shown itself in the dirty boxing he has used to great success, but Couture has a very nice right hand, with which he rocked Tim Sylvia. Couture also is quite good with his left hand, and it was his jab and left hook that really won him that first fight against Chuck Liddell.
Bonnar is the embodiment of mid-level fighter today, considered a jack of all trades and a master of none, but every opponent going against Bonnnar has to respect his boxing. Bonnar is a two time (2002, 2004) Chicago Gold Gloves Champion, one of the the toughest amateur boxing tournaments. Accurate and smooth with his combinations, Bonnar is still one of the better boxers in the Light Heavyweight division.
Florian has been a solid striker for much of his UFC career, known mostly for his Muay Thai elbow strikes, but it was the addition of boxing that made him an elite striker in his weight-class. He used his solid jab and powerful straight punches to dominate Roger Huetra, Joe Stevenson, Clay Guida and Takanori Gomi.
Georges St. Pierre
Pierre's work with Freddie Roach in the lead up to his rematch with Josh Koscheck has clearly paid off. GSP has always had good striking, but he showed a very quick and stiff jab in his most recent fight. It was surprising heavy for GSP had never shown much power in his left hand before and with his first punch he broke Kos' orbital bone.
Antonio "Minotauro" Nogueira
Big Nog is here mostly out of respect for his career. His decline has been very sharp and his stalking style has turning into plodding and his KO losses to Frank Mir and Cain Velasquez show how much speed he has lost. But in his day, "Big Nog" had some of the best boxing in MMA.