Tough one, and I like Rios' price a lot, but I think it might be worth a gamble on Holland and Cobb to see what they can do in the coming years. Morales seems too expensive given what he will likely do in Seattle from here on out, but at least Seattle seems to be trying to get him some help with Morse. If you think 1B is very valuable to have, then go for it.
That's what I was thinking too. I can get a CI for that price or cheaper in the auction probably, but like the upside of the other two. I have Konerko at 1B so Morales would be my CI.