Unless I missed something, MARS hasn't surfaced since he asked the question in post 1 - page 1.
Threw the bait, sat back and watched the feeding frenzy.
Not a bad effort for a "new to boating".
Anyway the Yammie and Mercury 60 efi 4strokes are the same weight as the 60 etec (about 110 kg), so the 4st weight peanalty isn't an issue here. Suzuki 60 4st weighs 162 kg and Honda don't have a 60 hp yet so not too sure where MARS is comming from so I assume these are out of the comp. So its down to dealers/service reliablilty, reputation, track record and cost. Last time I looked at "RRP pricing" the etec was $1000+ dearer than the Merc, Yam, Honda (50hp)and about $200 cheaper than the Zuke.
I have a Yammie 60 4st and can't fault it. They get good wraps in all tests I have seen but then so do all the other motors listed.
Do your research (thers heaps of info and testimonials out there), go for a test drive and get some references from dealers.
Cheers
Very hard thing to say i think stick with 4 stroke yamaha is the pick of them only because of resale etc.