My setup
999si @ console
859 @ bow
TM 360
All linked together and working good.

I am wanting to add another LARGER unit to the bow to better utilize the 360 and to keep from having to split screen for maps or 2d/map.
Universal Mania has a pretty good buy on the Helix 12 si currently or would you go ahead and shoot for the Onix (seems some have sold in the $1500 range), also I'm thinkn another SI unit is maybe overkill but would serve as a backup to the console unit.

OR wait to see what is coming out new with all the chatter that is going around!!
Decisions.....decisions!! lol