Sabie
The TX3100 is quite a good radio BUT they die at the 1st hint of water
(seen it ) so mounting on the bars is not a good option.
There TX modulation can be low too so be aware.
The aerial in the pack will be hard to mount on the ST (not many magnetic surfaces
, and I rcommend a GROUND INDEPENDANT aerial with around 4.5 dB gain too
The Sena I cant comment on
That price is better than my buy price on the radio alone