Ok, I was all set to buy a Humminbird 798si, then all this talk about Lowrance and the possibility of them coming out with SI has me wondering what the best buy would be. I was looking at the smaller Lowrance HDS and it goes for around $785 on J an H, where the HB 798si goes for around $850. Both have color FF and GPS, but I keep hearing of the problems with the HB GPS. I'm not a technical genious and I'm not sure I understand how the issues affect fishing. Does this mean if I see something on the SI or FF and mark it as a waypoint, that it won't be accurate enough to get me back to it? I then hear Lowrance has better GPS, and the HD thing looks awesome. If the rumors of the Lowrance SI are true, then I would be able to upgrade to it with the purchase of the new transducer? Is this how you guys who are in the know understand it? Basically, if you were me, would you buy the 798si and move on with no regrets, or but the Lowrance HD and hope the rumors are true? Help please.