Replying here cos this has had more recent action than the other thread....
PErsonally I think it's a tough question, both have there merits. The way I see it now tho is that while a trophy now would be great, and something tangible in the record books, if we were to make it into the CL group the cash and cache that comes with that could help us attract the kind of players that will give us a better chance of winning more cups over coming years. If we were already closer to the Final it may be a different matter, but generally speaking the FA Cup would be a nice short term boost, whereas CL Qualification could have a more long lasting effect, which while it doesn't look as good in the record books or give us that day of glory, would be more beneficial to the club overall.