I just voted with my wallet for a 90 E-TEC for my Searider. I spent many months digging around various internet engine forums. After torturing myself long enough, I picked the E-TEC. Second lightest 90 hp on the market was a major factor, as was the low maintainence requirements. Tohatsu/Nissan TLDI is a touch lighter, but not as clean (2 star vs. 3 star). Clean, efficient, can run without a battery, which Opti and Tohatsu can't. Loads of Evinrude dealers everywhere (my boat travels ALOT). Personally, I like two strokes , and I'd rather just pour some oil into a resevoir, rather than have to change it, with the related hassles of disposal, or dragging the boat to a dealer to do it (weight too), so I leaned early toward new tech 2 strokes, E-TEC & TLDI.
The new Honda is a huge step up over their previous 90, I would look more closely at that today. I wouldn't even consider a new carbed motor, so the old Honda wasn't even in the running. The 90 Opti is a porker, over the rated weight for the transom of the Searider, IIRC. That put it out of the running for me, it's simply not competitive by that measure, which was very important to me (sorry ashby!)
I ran the E-TEC long & hard every day for two weeks and I'm happy with my decision. I don't have an aweful lot of hours on it yet (40-50?), but I can't speak highly enough of it. YMMV. E-TEC was more expensive, but I do beleive I'll make it up on reduced maintainence costs in the long run. I managed to get myself enrolled in the Evinrude "Professional" program, which brought the cost in line with many others (and got me a bunch of free clothing!)
I tend to run every day for week long streches, putting on 20-30 hours quickly. I also do a lot of low speed operating, where the DI engines are most efficient, particularly the E-TEC. I'm using <50% of the fuel I did with my 25 year old carbed Merc 80. Not a fair comparison to any modern engine, but WOW! Better than I expected in that regard.
In the end, it would be hard to go wrong with any modern engine, but the E-TEC is it for me.