A lot is going to depend on the costs of each of the players involved, and any sort of keeper restrictions there may be.
On the face of it, it is hard to judge. Johnson is someone I really like and will hopefully bounce back from surgery and return to being a dominant starter. Most recent reports is that he is on track. Feliz is moving from the pen to the rotation, which is a good move in the long run. For the upcoming season though, he will probably be on an IP limit, which may cap his value.
If you can just copy your roster over without doing a link, that would work as well.
On just the info you gave, I would not do this deal. JJ has the upside of a #1 IF he can stay healthy. Odds are that won't happen but when he does pitch it is usually very good results. I would rather gamble that he will stay healthy then hope on any of the guys you are getting. I don't see Nova repeating last years performance, Feliz is a wild card and probably not someone I would put much money in. Both Middlebrooks and White have some good upside that could match what Nova and Feliz gets you.
Of course this is without knowing salaries which is the important information. If JJ is over-priced and Nova/Feliz are bargains then it changes the entire question.
Also, Welcome to the Cafe. This a great place to learn about fantasy baseball. Right now it is pretty slow in the forums but starting in January things will start picking up. Feel free to ask any questions you might have, their are a lot of smart, helpful people here.
"In the beginning the Universe was created. This has made a lot of people very angry and has been widely regarded as a bad move."- Douglas Adams
Monstaz yr Pos 442 Chris Iannetta 1 C 4 1B Omar Infante 3 2B 7 Jose Reyes 4 SS 65 Wilson Betemit 3 3B 4 Gerardo Parra 1 LF 1 Marlon Byrd 2 CF 6 RF Alex Gonzalez 1 MI 15 Alex Rodriguez 1 CI 95 Melky Cabrera 1 OF 8 Vladmir Guerrero 2 U 4 Tommy Hanson 2 SP 4 Johan Santana 2 SP 24 Josh Johnson 4 SP 24 Kyle Lohse 1 SP 5 CC Sabathia 2 SP 70 Jonny Venters 3 RP 7 Mariano Rivera 1 RP 30 Jaun Carlos Oviedo 1 RP 7 Kerry Wood 1 RP 2 Jerry Blevins 1 RP 4 Huston Street 3 RP 15 Ramon Hernandez 1 C 1 Adam Kennedy 1 1B-2B 1 Willie Bloomquist 1 SS-LF 1 Jordan Schafer 3 CF 2 Alex Presley 1 LF 1 Vicente Padilla 2 SP 2 Vance Worley 1 SP 1 Fausto Carmona 2 SP 24 Joba Chamberlain 4 RP 7 Ernesto Frieri 1 RP 1
We also have a minor league roster. Here is mine:
2 Will Middlebrooks 3B 4 5 Julio Teheran P 3 1 Tim Beckham SS 5 3 Alex White P 4 4 Jon Schoop 2B/SS 3 1 Wagner Mateo OF 5 1 Jared Mitchell OF 5 3 Brian Goodwin OF 4 5 Hector Noesi P 3 1 Jose Ceda P 5 5 Donavan Tate OF 3 12 Max Ramirez C 1 4 Juan Duran OF 3 3 Collin Cowgill OF 4 6 Ryan Flaherty 2B 3 3 Xavier Avery OF 4 2 Brad Holt P 4 6 Carlos Perez P 3 1 Andrew Brackman P 5 2 Jordan Parraz OF 4 4 Jose Altuve 2B 3
If you all need to see the other rosters I can email any info. Thanks a lot.