The first thing for me with a bar is fit, ie: width and drop/reach and shape, regardless of brand name, origin, or material. Most of the 'Italian' marques (ITM, Deda, Cinelli, 3ttt, Stella Azzurra) are measured O-to-O rather than C-to-C for width, so be aware of that when you're shopping around. Because what fits me might not fit you, it's hard to recommend any particular bar - there are so many very good ones and so many variations now. Try a few models if you can.
In 'Italian' bars I've owned 3ttt Prima 199, ITM The Bar, Deda Newton, Cinelli Nerve. All were the widest size (46mm O-O) but weren't quite wide enough for me on the tops, so I usually end up going with a C-C 42mm., which for say...Easton and Ritchey...are just a tad wider than most 46 O-O sizes and fit me better.
Once I get the best width, then I look at the overall shape and the reach & drop to see if I can live with it over the long haul. But that's just me - other people will have other priorities.
With a stem, once you get the angle and length you need for the best bar position, I suppose it comes down to weight vs. stiffness, cost, aesthetics, etc.
