OPS is sort of a junk stat in a way it's adding two numbers that aren't calculated the same. Plus, as you said, OBP is more important but OPS gives the same weight to SLG and OBP.
If you have a player that has a .500 OBP and .300 SLG, his OPS is .800. Likewise, you could have a player with a .300 OBP and .500 SLG and his OPS is also .800. The first player is much more valuable.
If talking just about offense, there are all kinds of advanced stats available in OOTP - wOBA, wRC+, etc. It's hard to pick a "best", ideally you'd look at a bunch of numbers to make the determination. Defense matters, too, as does the composition of your team - sometimes it's okay to have a lower OBP slugger that has a lot of power to round out your lineup, for example.
My personal experience is that if the "Avoid K's" thing gets too low, the player just doesn't make enough contact to be useful. In and of themselves, strikeouts aren't that bad but if the player is striking out 30% of the time, it makes it hard put up numbers. In MLB, the lowest number I have in Avoid K's is 40, that player strikes out 28.5% of the time but is still a 3-WAR player (at C). Guys in the minors have 35 in Avoid K's and they are basically replacement level. Of course, a lot more goes into that than just avoiding K's, just speaking in generalities.
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