Vettori has been serving the New Zealnd over the last decade, although he was steady but was never a real match winner.
Razzak seems like more of a oneday type bowler and has the variations to keep the runs in check and take regular wickets too. Is a totally unknown quantity in test cricket.
Panesar seems to be over rated a bit to me. He is yet to develop his variation and can be an extremely good find for England if he develops.
Rafique is the old guy who still keeps on serving Bangladesh cricket. He was a seamer but turned into a spinner in the early stages of his career. He has a good arm ball and has always been a steady performer.
Hogg is the most impressive one of the lot but like Rafique an oldie. He is quite different than the rest as he is a chinaman bowler.
Ohh in Dave Mohammed we have another chinaman but West Indies selectors are not always in the mood to play a specialist spinner so his chance of getting international expesure is less.
Murali Karthik is the only one that comes in mind from India. It's sad to see India which produced SLAs like Bished Bedi dont have any good quality ones now.
Abdur Rehman also has played some matches for Pakistan and is an okay sort of bowler.
Enamul is the most promising one and has all the qualities to become Bangladesh's first real match winner. I have very high hopes of him.
May be Giles can be included too in this list along with Paul Adams.