buying a chuck
a few years ago when I started turning I searched high and low for this bit or that bit of info and asked everyones advice on which chuck to the point of where I was just an annoyance and then when i though I knew everything there was to know aboute very chuck without having actually used much less owned any of them when the best piece of advice was given to me by a guy named Bill, "Go out and just buy damned named brand chuck and be done with it!" In the end this was the right advice. Every brand of chuck of chuck has every kind of imaginable jaw set that the others have with only minor differences that are so minor they really don't make much of a difference. If you want dovetailing everyone has them, if you want wood crushing grip every maker has those too. This actually leaves you with only the important details to make a decision on; price, expandability, and portability. I went with an original Nova it was the cheapest I can use all the jaws I bought for it on the supernova I just ordered plus I can use talon and OneWay chuck jaws and lastly the Nova line will fit most every lathe i could put it on except for those with 1 1/2" spindles or bigger, which I am not likely to own any time in the forseeable future.
As far as the Talon goes it too has the ability to use Nova, Talon and Oneway jaws which is a plus but really no better than a supernova in its build and certainly not in its price. The only chuck that has more versatility than the Talon or nova chucks is the Axeminster based Versachuck which will take axeminster, nova, oneway, talon and vic jaws, but costs a small fortune with as i understand it
As far as cole jaws go I think they are a waste of money that most turners could smply do without. You can buy everything you need to vacuum chuck for between $75 and $125 if you shop ebay for you pump and some of the parts. There are also several really low tech ways to hold your turnings every bit as well if not better and certainly cheaper than buying a set of cole jaws. With a bandsaw, drill press, glue and a piece of 2x6 scrap you can have the best box finshing jaws you could hope for.