I have 2 HX's - one mobile, the other base. I like the HX version ($979 + shipping from R & L). I have the voice guide in the base. I use tuned antenna's and the HX model is built a lot more rugged than the SAT. I use a single IOTA DLS-55 for the base - $100 + $15 all day long on fleabay. Homemade base mic is a HC-5 element on a baffle board in a base mic stand - $30 (I get compliments everytime I shoot DX), and the mobile mic is a ratshack NC power mic that I have modified to use the +8v from radio and eliminated the battery.
The RJ-45 mic plug is super easy. Get a couple of sheilded CAT5 cables and cut one end off. Wire up mic with the cut end and presto - you have a sheilded RJ-45 mic cable with a strain relief to boot.
The best thing about the HX is that it TALKS much better on AM (hint: use the processor) than the SAT version. With my stock HC-5 mic I run 40/40/40.
Here is the pin out for using a standard 568B CAT5 cable:
pin1 - White/orange - up
pin2 - orange - +8v
pin3 - white/green - mic gnd (TS-480 only)
pin4 - blue - PTT
pin5 - white/blue - system/chasis gnd (TS-480 only)
pin6 - green - mic audio
pin7 - white/brown - NC
pin8 - brown - down
Normally, Kenwood has pin3 as system gnd and pin5 as mic grnd on their RJ-45 mic jacks, but in the 480, they were flipped. The stock handmic comes wired correctly.
If you use a NC mic that has a metal screen for RF protection or internal foil sheilding, you can wire it and the sheilded CAT5 drain wire to pin5 for chasis gnd.
I use my HX in the mobile to drive a TS sweet16 and it works perfectly. People can't tell if I am mobile or on the base.