By "not unreasonable" I guess I should have said, "at some point over the course of 7 or 8 seasons you could be able to do it if you get a little lucky and sacrifice some defense."
I don't know how to post player links (probably posted somewhere prominent, I haven't been able to find it; wouldn't mind if somebody explained it to me real quick) but my team in No Quitters has a:
*DH w/ hitting ratings of: 95/94/89/69/85 (career 1.075 OPS, costing me 9.0M, got him in a trade for a good CF prospect)
*1B w/ hitting ratings of: 82/81/87/70/96 (career .909 OPS, costing me 7.8M, got him in a trade for a good 2B prospect and a decent RP prospect)
*LF w/ hitting ratings of: 75/73/80/84/72 (career .957 OPS, pre-arb was in A-ball when I took over the franchise)
*RF w/ hitting ratings of: 66/86/81/77/74 (career .912 OPS, signed him for 8.5M in free agency)
*2B w/ hitting ratings of: 76/89/44/81/85 (in AAA right now, was #4 overall pick the season after I took over)
In order to do that though, you are looking at having to almost certainly sacrifice some things in other areas. I am starting a SS platoon that features two players who were picked up off the waiver wire... so there are drawbacks I guess.
Realistically though, .900 was probably accurate for the steroid era, but since the update has appeared to have bumped SLG% down close to 10%, I guess .850 would be more accurate. They are OPS'ing between .863 and .971 this year, so .900+ is probably unrealistic.
However, if you really made a push at it and ignored some other things, I think you could find .850+ OPS at DH, 1B, LF, RF, 2B/3B and a ~30PC DH at catcher. I feel like that would make up for the other shortcomings your team would likely have.
OP, sorry for the hi-jack.