Hi all! New to this forum. I've been reading TPG and other sites until my eyes bleed... and thought some people out there may be better suited to answer based on experience rather than just general informational articles.

So... I have the following balances that I figure I would combine into SkyMiles and then use cash for the Hotel stay... but the question is, where to?

Delta: 120,000
Amex: 160,000
Marriott/SPG: 280,000 (= 100,000 Delta)

That gives me roughly 380,000 SkyMiles as of today, but with my work travel through the remainder of the year, I anticipate having a total of about 500,000 to book a trip for 2019.

What would be some suggestions for a great first class option for 2? That could include Miles + Cash if reasonable, as well.

Any suggestions and ideas would be greatly appreciated! Thanks in advance!