When I bought my 2120 new in 2007, I did a lot of research on the 150 4S vs. the 200 for the boat. After a number of discussions with Yamaha and Parker dealers and this forum, I bought the 150 and have been very pleased.
The 200 would have added 2 MPH to my top end speed (40 MPH vs. 38 MPH (for most conditions of fuel load, passengers, etc.) and 50 more pounds on the transom plus more cost and higher fuel burn. Probably get the extra engine cost back - or most of it - on resale. The last Yamaha engineer I spoke with said the 150 was the first engine in that HP range to be designed from scratch to be a 4S and he highly recommended it to me over the 200.
I installed the wider trim tabs and finally found the correct prop so I can hit the 5800 - 5900 RPM range and about 38 MPH WOT. To come out of the hole with a skier, as you may know, the big tabs will help and they would have to be all the way down as would the trim on the motor or you could look at the sky for awhile.
The last time I had the boat out of the water I raised the engine up one hole on the transom and the boat runs better. May go up another hole next time as the flat plate on the bottom of the engine still is not completely on top of the water at WOT and trimmed properly but could be a marginal gain at this point..........................Pete