>> ... I'm considering an IQSmart3..
Finally!
If you are looking to scan 4x5 and larger, then an Evermart Pro II (3175 dpi optical) and higher Eversmart models could be as good if not a better choice than an IQSmart 3. They are faster and have better optics.
Scanning with borders on a flatbed is not easy. It requires precise masking or you unavoidably will get flare and contrast reduction around edges. If you go with precise masking then it may negatively impact productivity as fewer sheets of film will "fit onto the glass", alignment of each sheet will be trickier and chances of getting dust all over - higher .
Wet mounting is almost a must (to fight the dust , contrast reduction, and most importantly "un-flatness"\curling of film). Many may disagree ...
If you decide on wet mounting - try to get your Smart with anti-newton glass instead of coated one (to save on buying the anti newton separately) . Wet mounting station is absolutely not required , a good roller is.
Resolution-wise Smarts are as good if not better than a Tango (since you mentioned it), but they cant beat Tango in overall fidelity of image reproduction. IQSmart3 optics are not perfect and on a side by side with Tango scans on certain images with high frequency patterns it suffers from some chromatic aberrations that are absent in Tango.
I won't by a Smart model that does not allow to scan into DT format (a Creo proprietary RAW).
SergeyT
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