Whilst the 175 is ideal as it is the same weight as the 150, you will struggle to find one. I've only come across one other on here! The reason is the retail price of the 175, it is vastly more than the 150, which itself is only a little more than the 135.
Reason i believe is the 135 and 150 are exactly the same, just a different ecu. The 175 has other parts as well as the ecu to make it more powerful. As a result, most punters take the 150, which on the 6.3 OP hull is plenty for most, hence they're the most common.
If you jump to the 200, the engine weight jumps too, as it is a 3.0 block. I think excessive on the 6.3 hull, but over 6.5m perhaps the better option. More money, more fuel, more costs though.
Check which beam OP you are looking at, they do vary! Ours is the 2.34m