Really really tough choice. If we won the FA cup it wold be another trophy to add to the history books, whilst who looks backs in 10 years and says "Wow they finished in the top 4 one year". This could be our best chance at winning the FA cup in a long time. As i feel we are the second best team in their, and we could still beat United.
We haven't won the FA cup in decades, far, far too long for a club as big as Villa. Another F.A cup and it would pretty much shut up the Spuds and Newkie fans about being a bigger club.
Saying all that, I voted option A, do people forget the FA cup comes round every year? We could win it next year, and not risk falling out of the top 4 because of it. A couple of squad signings this summer ( They would all be easier to attract finishing in the CL spots than 5th) and we would have the team to be competitive in more than just 1 competition. Although we are being competitive in 3 right now i can see us tiring in the final stages because of the amount of games.