I have 2 friends, one has the sea runner 22 ext transom and enclosed hard top with 150 and the other has a 22 oceanpro ext transom enclosed hardtop with a 175.
There is a major difference in how each boat sits at rest and trolls. The oceanpro is much stabler. Both run awesomly but the oceanpro is worth the extra $.
I wouldn't buy the 22 searunner. The guy who has the oceanpro is 300lbs and goes out with his 300lb pop and a buddy and the 175 does just fine. If you were a regular guy you could get away with the 150 but why not go with the 175.
That is my opinion and my experience on both... the oceanpro.
Sobie2