re: Credit Card Rewards and Points Discussion

Hey CC gurus. I could use a little advice on if this is a good plan.

The wife and I are planning a trip to Europe in 2016 and we are pretty sure we can use all points.

I have ~500k Marriott points so that should take care of 10-14 nights at Marriott properties in Europe from what I've seen online. We don't know exactly where yet, but I'm not too worried about that part yet.

As far as flights, I only have about 30k united miles, but I have 155k UR points from my sapphire (not preferred). I have always planned on applying for CSP in the near future to get the sign up bonus and then transfer my UR points to United miles. This would get me to 225k+ United miles which should easily be worth 2 round trip economy tickets to Europe. I might be able to get it to first class if I can time it right.

I also have about $1,000 cash back on an Amex Blue Cash Preferred that I plan on using to offset some general spending/dining, etc. on the trip.

So here is the question. I have never been CC churner (have kept all my accounts open) but I am considering doing the United explorer card 50k bonus right now to add some more miles to my United account. Credit Karma has me at about an 800 credit score and it has always been accurate in the past. Should I apply for this, get the bonus miles and eventually cancel, and then apply for the CSP to transfer the UR? Or am I being greedy and should I wait for just the CSP? I assume with an 800, I could get both pretty easily? Would applying for them in a span of 6 months be bad?

Also, most importantly, we are hoping to buy a house in about 2-3 years. Would any of this really impact my score in 2-3 years if I close both accounts in less than a year?

TIA