Ok, since it's a keeper, that makes it easier. I'd say that your 3 keepers are LaPorta, Wood, and Riemold.
LaPorta - I think that he might get shuffled a bit back and forth between the big club this season, but, like the previous poster mentioned, the kid can rake. I'm thinking along the lines of a Brad Hawpe with more power. He'll hit in the .260-270 range with 30+ bombs if he can stick with the big club for a full year. That's a big if though with the Tribe being stuck with Hafner for the next 2 (?) years. I don't think that LaPorta fits well anywhere but 1st or as a DH, and I just don't see him getting the chance to do that this season for Cleveland.
Brandon Wood - I think that the previous poster hit the nail right on the head comparing him to Glaus. I think that he is in the same boat as LaPorta with the call up-send down problem, but I think that with Anaheim's lack of offense eventually they'll have no choice but to give him an everyday spot, be it 3rd or short. His production at what is arguably one of the thinnest positions in baseball makes him a fantasy stud when/if he ever gets a chance to stick. Thereby making him almost a no-doubter as a keeper.
Nolan Riemold - His having an everyday starting spot pretty much locked up makes him valuable this year already, not to mention the fact that the kid is playing for a solid young offensive team and he'll get plenty of opps. to prove himself, and I see good things for him. What I'm seeing him become is almost like his teammate Nick Markakis. Decent average, decent power, a guy who really doesn't do anything spectacular, but flies under the radar and helps across the board.
Jake Fox - I've seen plenty of Jake Fox and heard everything that the hype machine can say about this guy, so here's my honest opinion of Jake Fox... He's at best a decent DH. He can't field to save his life, he murders mediocre AAA pitching, but has no clue when going against guys that can change speeds against him or guys that throw breaking stuff with good movement. Unless you see him get traded to an AL team that is in DIRE need of a DH, I'd definitely cut him loose. I see no chance of the Cubs putting him at 3rd, since he's such a defensive liability at every position, and plays the OF like Adam Dunn with two broken ankles and an eyepatch over one eye. Basically the whole reason (IMO) that the Cubs brought him up was to appease the fans that see him slaughtering minor league pitchers. Sure, he can help for interleague games, but other than that, I honestly can't see the Cubs fitting him in anywhere.
Fernando Martinez - In all honesty, I don't know much about him, simply because I haven't scouted him much since I didn't project hearing much about him for at least a year or two. I can't tell you to keep him around. He does project to be one of the best OF'ers in the NL, but 3-4 years from now. I think that he's way too green, and really feel that the Mets just want to get a look at him with all the injuries they have. This way they can get a first hand look at the holes in his game, and get him to work on them when they send him back down. I think that he'll be solid, but not for a few more years.
Goodnight Ladies! GOODNIGHT SIR!!!
Hit the lights sweetheart!