Without having used any guns made after 2004 and going on my experience with the Hitachi Corp I would suggest looking at the Hitachi NV75AG or the NV90AG, they utilize a wide range of fasteners from 1 3/4 to 3 1/2", (the largest NV75 nail is only 3"). Regarding wire or plastic collation, while the plastic will fly, pretty much all of it is removed during normal daily/weekly cleanups. In 30+ yrs I've never heard of anyone ever taking a plastic chunk in the eye, (with or without eye protection). Regarding wire collation, unless they radically changed the method of releasing the nail from the coil there is no debris. The wire is thin and severed halfway between the nails as it is driven. However a strong 1/16" of wire does remain and protrude from each side of the nail. This does not affect the gun, nail as it is driven or the item being fastened.
On another note, I have been required to pull nails from 4 or 5 crew members over the yrs. Wire collated nail make a mess of
I have 2 very old Paslode SK312s, (1985) inline, (sticks) paper collated both still kick butt, they are like the 1911A, the timex that takes a licking and keeps on ticking, you can't find them anymore. A great idea on the 312 was the application of glue to the nails prior to the paper collation, as the nail fired the glue melted then set after some time, (not so good on wet and or frozen lumber).
Most of the refits over the last 30 yrs to all the newer guns, while adding many bells and whistles, have made them vulnerable to just about everything. I also have Hitachi nailers but not in the spike range, 6/8d, roofers and box nailers, I used the box nailers more for red cedar shings. Most are from the mid 80s, all my construction guns minus the Mak AN611 are prior to 1992. Back then a lot of crews used Bostitch coilers and some had Hitachi stick and coilers, one of the great things about the Paslode 312 is that it had the ability and power to let you tack nails, (for temporary items) that the other guns did not.
Good luck on your hunt, have you considered renting a gun? You might consider talking to a local repair shop to find out what comes in most for repairs. This might help you decide on what to buy