The trade is pretty even. You're trading the more talented, but injured player [risk] for healthier, but less talented I. White [stability].
What is the level of risk/reward you can stomach in your pool? Last I heard Markov is supposed to return by the end of October [knock on wood].
Does your D need help now? The extra weeks from White plus the unneeded uncertainty of Markov's ability to hold up once he's back is possibly a load off of your shoulders.
If Markov plays 5 months this season you'll lose this trade. Can you live with that possibility? Then make the deal. I know I dealt Markov last year from my keeper roster.
10 Team [keep 10 + 4 prospects]
Scoring F=1[g/a]; D=2[g], 1[a]; G=2[w], -1[L], 1[OT], 2[SO] Top 12 F, 6 D, 2 G count
Forwards
Crosby, Ovechkin, Backstrom, Wheeler, Byfuglien, Hornqvist, Simmonds, Ladd, Zuccarello, Ribeiro, Desharnais, Semin, MacArthur, Moulson, Purcell, Soderberg, Dupuis
Defense
Keith, Goligoski, Carlson, Krug, Trouba, Streit, Pouliot, Ceci, Nurse, Martinez
Goalie
Fleury/Price/Rask