I repowered my Livingston Viking 192 this spring. After much study, I chose the Suzuki DF140A.
There were quite a few reasons I chose this engine, but the two main ones were reliability reports & weight.
The 140 Suzuki is basically the same as the 90 hp. I think the 140 is 14 lb heavier.
Any of the 150s on the market are significantly heavier. And a bunch more expensive.
The factory specs on the 192 Viking list the hull weight at just under 2,000 lbs. Add the main outboard, 2 batteries, 65 US gallons of fuel & a 9.9 Yamaha kicker & it makes for a fairly heavy boat for its size.
The hole shot performance is not quite as good as the old 125 Merc 2 stroke, but it's pretty good. About 5 seconds with 2 big guys, full fuel, lunch, ice & gear.
I still need to play with prop pitch, but with the factory prop I get 5800 RPM at WOT. (Max is 6200)
At 4500 RPM I get an easy 25 MPH. Around 38 MPH at 5800, trimmed right out on flat water.
So far I really like this outboard. I have about 55 hours on it to date.
Number 2 on my list was the 135 HO E-tec. The main reason I didn't pick it is because it is much more complicated & the reliability reports I read weren't as good as the Suzuki. I expect the overall performance would be better with the E-tec.
So... Take all this as you like. Just my limited experience. 2 cents worth of free advice. Hope it is helpful.
Have fun with your repower!