Nog is badass... Sperry, Ruas, man I could go on...
Randy is truly a quintessential champ, a cut above IMO...
Tank got subbed by Kimo and destroyed by Cabbage in his last couple fights. He's always had a bad boy attitude and donkey punch power but lacks good technique for anything but haymakers, has a decent sprawl at best, gasses out, pinner legs, etc.
Would I fight him? Well, I wouldn't look forward to it! but remember he's far from the same guy that KTFO'd Matua and Nelmark. Vitor, Ferrozo, Rizzo, etc. did him ugly.
Strikers that I would really not want to fight:
Vanderlei - even though he's small, he's badass
Gilbert Yvel (one of my favs)
Remy Bojanski
Jerome LeBanner
Cro-Cop
See, all those guys not only can KTFO with punches, but with knees, elbows and kicks as well... things I've never really seen Tank do.
bloody knuckles DO suck and it looks ghetto as well if you work in a place where people get scared by MMA.
work on your combos, set things up behind jabs and thai kicks
http://stickgrappler.tripod.com some GOOD stuff on that page
remember, heavy bag work is only a small part of the overall picture.
cheers,
erik