Most higher end tonearm makers will offer their tonearms with "captive" cables as an option, so you have one wire from cartridge pin to phono input. For sure, this is true for Reed and Triplanar; I own one of each, both with captive cables. Clearaudio tonearms are not unique in this aspect.
Re balanced connection: You really already have a balanced connection, as 99% of cartridges offer a balanced output if the wiring permits. To connect the cartridge to a balanced phono input, you simply use the "Ground" lead from the cartridge as the negative phase of a balanced signal. Optimally, therefore, you want the ground wire to be a conductor identical in type and quality to the conductor used for the positive phase of the signal. By convention, the positive phase, aka "Hot" on an RCA connector, attaches to pin2 of an XLR connector, and the negative phase, aka "GD", attaches to pin3 of the XLR. pin1 is then where to connect the shield and any audio ground wire. Since the internal wiring of most tonearms already uses the same conductors for what becomes Hot and GD in a single-ended connection, all you need is a balanced cable (defined as per above, where the pos and neg phase conductors are equal and terminated in an XLR), and of course a true balanced phono stage. (Be careful of that. Some phono stages that offer XLR inputs are not truly balanced internally.) Also, you could get away with just re-terminating a single-ended phono cable where ground is carried on the shield with XLRs, but that would be a compromise with respect to optimal.
"Transimpedance". I really dislike that term, although it is in common use these days to indicate a current-driven phono stage. Because it's misleading. MC cartridges with high-ish internal impedance, say 20 ohms and higher, are not necessarily so well matched with SOME current-driven phono stages, because those phono stages inevitably have an input impedance greater than zero, and because the current output of the cartridge is a function of its internal resistance. (I know a lot of audiophiles break my "rule" by driving transimpedance stages with say a Denon DL103, which has a very high internal R. That's life.) The lower the internal resistance (and the greater the voltage output) of the cartridge, the more current it can deliver. If I am not mistaken, most current-driven phono stages seem to consist of an input stage that converts current to voltage. Then the downstream circuit functions much like any other phono stage. The I to V conversion is best done by a solid state device. Hence most current-driven stages are at least hybrids or fully ss. If it were me, I would check on the input impedance of any current-driven stage before purchase. Ideally you want the Z to be as close to zero as possible.