ill start who are good boxers to watch for the regular gaurd in orthodox and in the southpaw stance. also who are the best to watch for footwork. and who for the jab weather its stiff or speed
I would say Winky Wright or Juan Diaz for a solid fundamental "amateur" boxing style, gloves held high with simple but effective punching and combinations. For footwork I would personally say Bernard Hopkins - His balance and poise on the inside, and outside, is amazing. Mayweather obviously has very good footwork, but his may be a little more difficult to "emulate" As for a jab, I like Winky personally, although you should work on throwing all types of jabs, fast, stiff, pawing, etc etc and use them when neccessary. For a good orthodox jab, how can you look past Klitschko? He can control a fight with his movement and jab, even though he's a horrendously rigid fighter.
Lets throw Mikkel Kessler in there aswell. Very good fundamentally with an excellent "patient aggressive" frontfoot style of boxing.
I think sizzle has done a good job. Floyd and X have more or less the same footwork but Floyd gives it that youthful touch as he has more speed, agility and is generally just nimble.
If you have decent power and a good chin I've always liked Barrera's fundamental style: work off the jab with left hooks to the body or straight rights to the head while circling and keeping a tight defense, especially later in his career. Watch how orthodox he looks against Hamed. Or you could go with the even more technical Juan Manuel Marquez. Don't watch Pacquiao or Mayorga unless you have brutish strength and good speed for your weight - unless you are beastly that amatuerish onslaught can be disarmed. Ray Leonard is practically useless to learn from, as is Roy Jones, while they are fun to watch: go in there and be four times as fast as your opponent. Pure boxers like Spinks or Malignaggi are sometimes good to watch for both footwork and overall fighting strategy- they can't punch so they must be doing something else right to defeat stronger, more "dangerous" punchers.
You can use the speed argument with Jones but not Leonard. Leonards big wins were against guys who have good to great speed - Benitez, Duran, Hearns and Hagler.
I really dont study anyone, i watch boxing but i dont try to emulate styles unless i jsut wanan see how it works, (i've tried to pull a Frazier, and Toney before, both worked decent but not as good as the norm of course), mainly because im a slick southpaw and my style isnt really like a lot of people, and i dont try to do things im not comfortable with unless im forced..I love to fight inside and use my headmovement, but i also like to bounce and go from the outside.